I've only played the PC beta, some things may be different but not too sure. The reason I'm writing this review here is because my main gaming console is a PS3 and I've now pre-ordered it for the PS3 (it can't be much different)
If you're a MW2 fan like myself, and still can't get into Black Ops and Killzone 2 - this is highly recommended.
Black Ops' graphics and sound effects were absolutely atrocious, grenades sound like paper bombs and the hit detection rate is ridiculous. Killzone 2 is a good game but feels too sluggish for my liking, especially after playing MW2.
So if you're going from MW2 to Crysis 2, you'll have no problems, the gameplay is smooth and fast paced, gun effects are pretty much identical to MW2, the grenades could be more effective and the hit detection rate is very slightly off but nothing major. Remember, this is beta.
For those who are currently thinking "the whole armour thing is overpowered" you couldn't be more wrong, the power sets and classes are all balanced out nicely. You can't be invisible for long nor can you sprint forever. You have to play a little more tactically.
I just recently got a 7 Killstreak, so I had the Orbital Strike and Ceph Gunship, the strike is a cross between a Predator Missile and an Airstrike (both MW2), the AoE is pretty good, too. I've had 2 Strikes and each one got me 4-5 kills (more than you'll ever get from an airstrike unless you're lucky) Unfortunately, the match ended as my Gunship got on the screen....
Best of all - no camping! You can't camp for killstreaks, after a kill you have to collect the enemies Dog Tag, so technically, the Dog Tags are the killstreaks not the actual enemy.
Only 2 game modes on the beta, Team Deathmatch and Crash Site (which is exactly like HQ from Call of Duty - but made much more fun with the Nano Suit or whatever it's called.
Overall, awesome game, highly addictive MP to match MW2.