I beat the Modern Warfare 2 campaign last night.   I was blown away.  Mostly because I felt really disoriented near the end.  Was I supposed to feel that way?  Was that a cliffhanger ending?  Did it seem at all trippy to any of you?  I honestly don't remember all of it, I wasn't in the right state of mind.  Should I feel stupid because a game's ending is confusing me more than the ending of Taxi Driver did for about 10 minutes?  Am I over-thinking it?  Is there anything to get?  It's surely not as convoluted and confusing as a Metal Gear Solid story.  Should I mention I have ADD?
 
I think most people who bought MW2 probably went right into the multiplayer modes before trying campaign, I know I did.  But the campaign is definitely a dynamic and intense experience to say the least.  I'm not gonna say it's "like a movie" because that's not necessarily to the game's credit.  It's not like a movie.  But it can be very immersive.  Some really fucked up things happen.  I have to play through it again.  It's equally as engaging as the multiplayer, even though it lacks the longevity.  I'm just rambling now.
 
And those ending credits...what the fuck?  It's not a bad wtf, just a really unexpected and slightly bizarre way to play out end credits.
 
I think Infinity Ward, on their website at some point, have mentioned they like to pack in as many "holy shit" moments in their games as possible.  I'm sure they actually used the term "holy shit moments" too.  They sure delivered in that department.  I wasn't the least bit interested in this game when I first saw the footage.  I thought I was done with FPSes forever, but Infinity Ward really went above and beyond the call of...something...with this game.  It may just be the novelty of it, but I think I'm even more impressed with this as a sequel than I was with Street Fighter IV (my other favorite game).
 
I'm getting sleepy...yawn...

Campaign was very, very good. With the exception that it was short. I started playing it at 9:00PM one night and beat it around 12:00-12:30AM-ish? I did it on regular because I'm not a pussy but my balls still aren't there yet :P

The campaign was one of the best 5 hours of my year (I beat it in one sitting, despite telling myself I was going to spread it out over a month), and probably one of my favourite ever single player experiences per hour. What I mean by that is, games like, for example, Oblivion, are better games, but compare 5 hours of Oblivion to 5 hours of Modern Warfare 2 and MW2 wins hand down. 
 
My only complaint is that Veteran was far too easy. That's not to say it was a walk in the park, but I was expecting an onslaught that would take me months, like MW1s, whereas I beat it in one Saturday of playing, start to finish. The warnings you get for choosing Veteran seem like they exaggerate it way too much.

Loved it, just beat it a second time on veteran. It's only fault is that it's too short, as I also finished my first playthrough in one sitting.

I started playing it on Hardened then my harddrive got corrupted about half-way through, so I played on recruit to get back to where I was really fast, and ended up beating it in 3 hours :/

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Campaign was very, very good. With the exception that it was short. I started playing it at 9:00PM one night and beat it around 12:00-12:30AM-ish? I did it on regular because I'm not a pussy but my balls still aren't there yet :P

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I think my finish time was 5 hours 34 minutes.
 
Then I played through it like, three more times.
 
Oh, TC, about the credits...go into "Choose Mission", you can actually play the end credits level (Museum). Make sure to look on the help desks for a red button after loading up on ammo. And yes, it was pretty much a cliff hanger.
 
One of the best campaigns I've played.

I never finished the original (deciding to try it on Veteran was a mistake), but this seems like everything is WAY more aggressive and large scale. It's a ton of fun, but it almost feels like a different game. 
 
Maybe the best comparison is the change from The Terminator to Terminator 2: Judgment Day. Both are great, but the scope is so significantly different that the experience is a bit hard to compare.