Was under the impression that Jeff's bad experiences with glitches in the game were maybe an isolated incident but I seem to have run across a few myself: 
 

• Reloading at a checkpoint causes my character to be stuck in the ground and only able to lean, can't even look or perform any actions 
• Game refused to let me fire off a shot with the sniper rifle in one of the long range night missions until I reloaded a checkpoint
• Scripting bug meant that I couldn't complete a mission by stealth as an enemy refused to move away from his position which was meant to trigger a nearby spawn
• Various clipping/floating weapon issues 
• An indestructible bunker during the helicopter mission (Edit: Not a bug, apparently I just needed to use a different kind of missile as the normal ones apparently aren't explosive enough... Weird arbitrary scripting).
• Dead bodies inexplicably getting thrown into the air
• Scripting not working properly or refusing to start until you were in exactly the right position
• Unskippable CGI fake-in game cinemas - not technically a glitch but 1) It's 2010 yo, we shouldn't haven non-skippable cutscenes in games any more and 2) Remember all those 'in game' trailers they released initially to market this? All prerendered videos and not in engine - not noticeable unless you're playing at 1920x1080 on a PC then the lower res video comes on and your FPS sky rockets...

You\re playing the game wrong, obviously. Don't you know you're supposed to play it exactly as intended? Gamers these days, christ.

" Not to derail this, but I'm curious as to what gamebreaking bugs you found in GoW2? I played through the campaign in both single player and co-op modes and didn't have a single problem. Unless you mean the MP, in which case I never even tried it "

I experienced these:
- Couldn't finish a mission because of script not going off and there was no way to move forward, checkpoint restart didn't help - I needed to quit and reload from main menu.
- In one scene a squad mate pulls a tomahawk from the back of dead enemy, then he kicks that enemy from table to the ground... I saw this, then I got stuck and couldn't go prone which caused my death, after realoading the body was allready on the ground and the tomahowk stuck in the air, squadmate just pulled it from there and kicked the air...
- I was going forward while prone and I reloaded my gun, after that I took a shot nad the weapon "jammed" and I couldn't stop shooting. 
 
EDIT: 
- This one is more a lack of polish, but any time you approach a door, which you are supposed to be kicked open, you can see the cracks by just simply looking at that door. I noticed this before I kicked open first door in the game. Lame.  

That's just from the top of my head, I only played SP once and never gonna play it again.

I experienced not buying the game.  Pretty much made the whole damn thing unplayable, but hey, there's $60 in my pocket and not yours.

Good thing I waited to see the reviews and thoughts on this game first.  Saved me money that I could put into Fallout: New Vegas and Call of Duty: Black Ops.

" @CitizenKane:  Definetely, Jeff's review is spot on, this is just a 3 star game, NOT worth a purchase.  Also, I preordered Black Ops so I just hope I won't be crying here in some forum one month from now! I have allready paid for it, damn you hype!   "

I think it was Dorothy's a Bitch, you have to place charges on an AA gun to trigger the next sequence. Nothing happened and so for the next 90min I sniped over 200 Talibans in the facial region that could be seen in the next section. It coulda gone on forever, I coulda sniped the entire population of Earth and I bet it would still continue. Reloading the last checkpoint was no help, so I had to begin the mission over again from the start.

I don't recall Gears 2 having that many issues. At least not in single player.

I'm having major issues getting past the mission after "Dorothy's a bitch" with the apache. There is one house in particular in that village that has like five floating rpg's in the windows and I unload on them but literally cannot kill those things and get killed in the exact same spot every time I attempt it.

Some of the same ones. 
-Door wouldn't open when it was supposed to 
-In another part where a door is busted open, i kinda fell into the ground and couldn't move.  I could aim but that was it.  I reloaded but now I was stuck in the ground still so had to quit to main menu and load from there. 
-I think one of my guys tried to molest me when i was prone. 
Other issues, the night vision sucks ass, its like all the particle and mapping effects for textures disappear.  The only thing that looks good is the lighting, like from the sky.

" I experienced these: - Couldn't finish a mission because of script not going off and there was no way to move forward, checkpoint restart didn't help - I needed to quit and reload from main menu. - In one scene a squad mate pulls a tomahawk from the back of dead enemy, then he kicks that enemy from table to the ground... I saw this, then I got stuck and couldn't go prone which caused my death, after realoading the body was allready on the ground and the tomahowk stuck in the air, squadmate just pulled it from there and kicked the air... - I was going forward while prone and I reloaded my gun, after that I took a shot nad the weapon "jammed" and I couldn't stop shooting.   EDIT:  - This one is more a lack of polish, but any time you approach a door, which you are supposed to be kicked open, you can see the cracks by just simply looking at that door. I noticed this before I kicked open first door in the game. Lame.   That's just from the top of my head, I only played SP once and never gonna play it again. "

There was a issue with the SE version of the game on Steam where at the end of the game when you kicked the door down it would skip the ending and cut straight to the credits. Brilliant!

I'm on this section on the PC:
 
  

I never had any bugs during the singleplayer campaign, except for an odd sequence in which my squadmates stared at each other for 30 seconds before moving forward. In multiplayer, I jumped on a destructible bag of grain in Gazmar Town and got a "suicide." It seems the bag of grain was made of lava. But meh, a lot less bugs in this game than in BC2, so far.

" Good thing I waited to see the reviews and thoughts on this game first.  Saved me money that I could put into Fallout: New Vegas and Call of Duty: Black Ops. "

" I'm on this section on the PC:
 
  

Duder, it's over...

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     It's completely broken. The first time I went through it, it worked fine, just like in the video. I supressed the gun, all my guys moved up and the enemies began spawning. But after I died the scripting went to shit, and in my 10 subsequent tries, none of it has worked. I'm surpressing the gun loads, and even managed to move up to where it is, but my guys are staying put right back at the start and none of the enemies are appearing so there's no way of getting past it. I can only hope that restarting the level over again will fix it since restarting a checkpoint doesn't do anything.    It had actually been alright up until this point, but stuff like these rips you out of the immersion and ends up frustrating. Considering the amount of similar issues Jeff encountered, I can see why he wasn't particularly fond of it. "

" I never had any bugs during the singleplayer campaign, except for an odd sequence in which my squadmates stared at each other for 30 seconds before moving forward. In multiplayer, I jumped on a destructible bag of grain in Gazmar Town and got a "suicide." It seems the bag of grain was made of lava. But meh, a lot less bugs in this game than in BC2, so far. "

There was a moment i couldn't walk through a doorway, I had to reload to the last checkpoint.

I am actually having to add another bug to my list every time I play through a mission in the campaign in this game... which is a shame because I kind of enjoy it - bugs can kill the moment though but they're not too gamebreaking, at worst necessitating a checkpoint reload so far.

" @ElectricBoogaloo said:

" I'm on this section on the PC:
 
  

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     It's completely broken. The first time I went through it, it worked fine, just like in the video. I supressed the gun, all my guys moved up and the enemies began spawning. But after I died the scripting went to shit, and in my 10 subsequent tries, none of it has worked. I'm surpressing the gun loads, and even managed to move up to where it is, but my guys are staying put right back at the start and none of the enemies are appearing so there's no way of getting past it. I can only hope that restarting the level over again will fix it since restarting a checkpoint doesn't do anything.    It had actually been alright up until this point, but stuff like these rips you out of the immersion and ends up frustrating. Considering the amount of similar issues Jeff encountered, I can see why he wasn't particularly fond of it. "

Had the exact same bug, was to close to the explosion first time around and died. During the following tries the gun never got supressed. Tried it about 5 times, restarted the mission 2 times and finally was so frustrated that I reinstalled the game and replayed the missions again. A shame really since I was enjoying the campaign alot up until then, I did so after as well but the build up of frustration for that single bug turned into a fear of something similar happening later on in the campaign. "