Crapload of issues that doesn't get fixed, but the game is not a bad game, just the players.
This game mainly focuses on multiplayer, even though it has a very nice campaign single player that's over in a flash. Single player is an improvement to mw, and it's like a drive-in movie, realistic and exciting.Now, I don't want to talk about SP too much, MP is the part that everyone talks about. MW2 significantly improved from MW, and the character customization was definitely a part of it. Perks, more killstreaks and better winning kills. I didn't like the prestige part but that's probably how this game continues with replay value. Second of all, you have to play this game on steam with bad connection and no dedicated servers, that's a major problem, Infinity Ward is stupid enough.Also, the spec ops mode, no point, it's plain boring.
Pros:
Updated IW 4.0 Graphics Engine
Significantly improved from MW
Jaw-dropping single player experience
More weapons and upgrades
Perks,killstreaks and accolades
Plays better on steam
Cons:
Connectivity Issues
Short Single Player
No dedi servers
Pay more for more maps(DLC)
$60
Customizable Character cannot change facial appearance
everyone looks like midgets, literally 5ft tall (barely noticeable)
EDIT:
Game on PC is nearly unplayable now because it's so freakin hard to find a playable, more hackers, more connectivity issues that IW won't fix.
Update: I honestly want to give this game a high score because of how MW3 was even worse than this game, and both games are addicting...however it's Call of Duty, no real evolution in these games.