Mmm... My opinion on Crysis 2 is rather mixed actually.

Likes

Urban Combat
For a change , I don't need to crawl in the grass , wriggle around the soil and hide behind trees which hardly provide any cover.
TIME FOR SOME URBAN COMBAT! HOORAH!!

New Weapons
Who doesn't like a new arsenal of weapons which can blow your enemy's head off in a matter of second?
New , shiny , glistening , highly-polished weapons that can bust your enemy's nanosuit in seconds.

New Abilities
For once , you can finally kill your enemies with the environment at ease.
I remember the tough time I had trying to kill an enemy by flipping the car over with strength mode , now you can just kick it over and ta-dah! Meat pancakes is served!

Improved Physics
Well , remember the time when ordinary soldiers ( and yourself ) could just die from banging a rubbish bin in the face?
Remember how those enemies become boneless meat bags when their killed!?
Finally , that had been fixed... most of it anyway.

Better Atmosphere
Despite the "godly graphics" that previous Crysis game had provided , that is something very mechanic and "game-like" of the scenarios in the previous installments.
Fortunately , that had changed a drastic deal in Crysis 2.

Dislikes

Where did the vehicles go?
I know it's urban combat but I seriously miss the times when you could just use any form of combat that your comfortable with.
Vehicles , boats , aircrafts... now we'r just a bunch of men strapped up in tight suits running across rooftops and the roads of America.

Unequal Combat Opportunities
Owing to the new system of the game , newcomers may find themselves outmatched by older players whom have unlocked a majority of the skills already.
Sure , you may say skill comes into play here , but with all the overpowered buggers running about , skill hardly matters in such situation.

Unlock , Unlock , Unlock
Has Crysis been influenced by Call of Duty or something? I really hate the typical unlock system in shooters , it doesn't really give the idea of fairplay in the game.
I don't like my enemies being in a disadvantage nor do I actually like my enemies being in the advantage.
I certainly hope Crysis would stop mimicking other shooters , the thing that had set itself apart was it's originality.

Squeezy maps
Where did all the big maps ( Remember Mesa? It's my favourite map )go?
Now no matter where I turn , there'd be some guy shooting in my face.
The idea of tactical combat is going down the ash chutes.

Arupt shifts in the Storyline
I mean , things changed a bit too quickly from Crysis 1 and it's side-story , Warhead , non?
The general scenario and cast of characters have shifted too quickly for comfort.
It's like having a big crater in the centre of a flat plain.