Well, I've been on Giantbomb for a pretty long time now without an account, and now that I've got one, I figure I might as well start posting my opinions on stuff here. I've never had a blog, so this might be interesting.  
Now, I'm going to keep in mind that this game IS only a downloadable game and should be judged as such, but I'm not saying that Shadow Complex is bad in anyway to begin with. It's fully worth your 15 bucks and everyone who loves games should truly have a great time with it. However, while all the great parts of Shadow Complex are mentioned by everyone, I thought it would be useful to say some not so greatly designed parts.  

Well, I've been on Giantbomb for a pretty long time now without an account, and now that I've got one, I figure I might as well start posting my opinions on stuff here. I've never had a blog, so this might be interesting.  
Now, I'm going to keep in mind that this game IS only a downloadable game and should be judged as such, but I'm not saying that Shadow Complex is bad in anyway to begin with. It's fully worth your 15 bucks and everyone who loves games should truly have a great time with it. However, while all the great parts of Shadow Complex are mentioned by everyone, I thought it would be useful to say some not so greatly designed parts.  

Wrong. Shadow Complex wasted my $15 bucks. If this is one of the best games on XBLA, I'm going to stick to buying retail games.

" Wrong. Shadow Complex wasted my $15 bucks. If this is one of the best games on XBLA, I'm going to stick to buying retail games. "

@brainboy77 said:

" Wrong. Shadow Complex wasted my $15 bucks. If this is one of the best games on XBLA, I'm going to stick to buying retail games. "

Really? Why do you dislike it so much?

" Wrong. Shadow Complex wasted my $15 bucks. If this is one of the best games on XBLA, I'm going to stick to buying retail games. "

The only glaring flaw I found that wasn't mentioned much in reviews is the erratic framerate. During sequences with a large amount of enemies on screen (and considering the game at hand, large usually means seven or eight) the framerate can dip to inexcusably low numbers. I'm quite certain this isn't just my 360 acting up on me, as I haven't played a game with framerate issues like this since Mass Effect.

" The only glaring flaw I found that wasn't mentioned much in reviews is the erratic framerate. During sequences with a large amount of enemies on screen the framerate can dip to inexcusably low numbers. I'm quite certain this isn't just my 360 acting up on me, as I haven't played a game with framerate issues like this since Mass Effect. "

The framerate was really solid for a while, but then I got into a heated battle at a couple points and it was terribly low, easily under 10fps. With that aside it is a great game, but I can see why some people might consider it a waste of money. The unlocking of items and levels keep you playing for a bit, but the gameplay itself isn't anything special.

" @LiquidSwords: I hated it, dipshit, because for two reasons. A) The story was complete shit B) The ending was awkward as hell C) They give you awesome weapons but the stages don't allow you to use them to the most extent. D) The Complex is so goddamn confusing to traverse- they need to have a gta4-like gps system that gives you the fastest route to a place not predetermined. A blue line to anywhere you choose. E) Now, this is a minor flaw, but the graphics kept bugging out every now and then. There are your fucking reasons, you assholes "

I didn't have a lot of framerate issues.  Sometimes coming out of hyperspeed caused a slowdown, but that was about it.
 
@deFacto:  I agree with a lot of your points, but it didn't really detract from any of the fun of the game to me.  Though the grenades and missiles aren't anything special, the foam gun is pretty damn cool.  I used the later playthroughs to see if I could up the difficulty and still make it through alive, so having the map exposed isn't really a problem, either.  I can see where I need to go, but it's a question of whether or not I can survive the enemies en route.

" @LiquidSwords: I hated it, dipshit, because for two reasons. A) The story was complete shit B) The ending was awkward as hell C) They give you awesome weapons but the stages don't allow you to use them to the most extent. D) The Complex is so goddamn confusing to traverse- they need to have a gta4-like gps system that gives you the fastest route to a place not predetermined. A blue line to anywhere you choose. E) Now, this is a minor flaw, but the graphics kept bugging out every now and then. There are your fucking reasons, you assholes "

" @LiquidSwords: I hated it, dipshit, because for two reasons. A) The story was complete shit B) The ending was awkward as hell C) They give you awesome weapons but the stages don't allow you to use them to the most extent. D) The Complex is so goddamn confusing to traverse- they need to have a gta4-like gps system that gives you the fastest route to a place not predetermined. A blue line to anywhere you choose. E) Now, this is a minor flaw, but the graphics kept bugging out every now and then. There are your fucking reasons, you assholes "

Framerate was a mess during the turret sequences - fine for the rest of the game though (at least in my experience) 

" @LiquidSwords: I hated it, dipshit, because for two reasons. A) The story was complete shit B) The ending was awkward as hell C) They give you awesome weapons but the stages don't allow you to use them to the most extent. D) The Complex is so goddamn confusing to traverse- they need to have a gta4-like gps system that gives you the fastest route to a place not predetermined. A blue line to anywhere you choose. E) Now, this is a minor flaw, but the graphics kept bugging out every now and then. There are your fucking reasons, you assholes "

Yeah, an option to start the game completely fresh without wiping your data/level would have been nice. And yes, sometimes the framerate dips, but it doesn't stay low -- this is completely because the game uses SSAO, which makes the game slow down a lot more with each additional polygon face (in which case, blame the 360 graphics chip, not the code). Also the music wasn't nearly as memorable as SOTN or Super Metroid's... but those were full priced games which had an established score well before they each came out. 

For $15, I have no real complaints.
 
/grabs some popcorn

I have a lot of problems with Shadow Complex bud, so you are not alone. Besides the game-ending glitch that I encountered that is still pissing me off, I thought that the shooting was imprecise when it went to 3D and I agree with you that grenade packs and missile packs were unnecessary. GamerGeek's blog lists most of my other complaints, and I thought it was a solid, fun game but nowhere the 5/5 material many have given it.

" @LiquidSwords: I hated it, dipshit, because for two reasons. A) The story was complete shit B) The ending was awkward as hell C) They give you awesome weapons but the stages don't allow you to use them to the most extent. D) The Complex is so goddamn confusing to traverse- they need to have a gta4-like gps system that gives you the fastest route to a place not predetermined. A blue line to anywhere you choose. E) Now, this is a minor flaw, but the graphics kept bugging out every now and then. There are your fucking reasons, you assholes "

I'm going to stop commenting on this forum, cause you guys are just annoying

I've been playing the game like crazy lately, currently at the point where I've got my Friction Dampeners and I need to look for Claire aain. And I'm loving it. It has its negatives, definitely. But its still one badass experience. Worth the $60, if it were a retail game.

First off... Congrats on getting people worked up with your first ever review/ blog entry
 
and secondly:  I totally agree with the bad points you mentioned. Don't get me wrong... I still love the game to little bloody bits, and it was totally worth my 1200 points. But some of it could have done with a bit more thinking. 
 
I played it on hardcore on my first run through... and found the biggest disappointment to be the boss fights. It was cake because most of the time you just find a sweet spot and the bosses can't even hurt you. I'm not sure if this was meant to be strategy or just bad AI. 
 
EDIT: At the Drive In rocks! Never got into Mars Volta. But Omar's solo stuff is pretty solid too.