Not many of us have played the alpha test.

Crysis 2 being like Modern Warfare 2 is a very bad thing in my eyes. I am fine with taking their ideas and refining them, but some of the ideas like 5 custom classes is just outright theft. Crysis had tons of potential and that potential seems to be wasted in favor of a Modern Warfare 2 gameplay feeling.
Crysis has lost vehicle and air combat, 16on16 gameplay, and two Nanosuit modes, leaning and prone is gone...
So many features that made Crysis have so much potential has been removed in favor of moving towards an easy selling Modern Warfare 2 shooter.
5 classes is kinda pushing it, that is rather blatent, and I doubt they will change it because the limited edition trailer wrote it in stone. but its not like its a bad idea at all anyway. once again, MW2 is a very popular game, hard to go wrong with it, but I must agree that a whole company that did the TimeSplitters series could do better, but this is what they chose (so far) so Ill leave it up to them to make the descisions.
vehicles in Crysis were overpowered, everyone would just get in a tank or air vehicle and raqe everyone, and it was very hard to shoot it down with no lock-on. so there really no problem there.
the player cap really makes no difference because the code was editable to change the number of players anyway, and Crytek will prolly make Crysis 2 highly moddable.
besides, the cap has been tested and it seems to work the best, Ill trust them with it. leaning will be in the SP of C2, and no one would use it in MP anyway, best to keep it simple (although I dont remember anyone saying it wasnt in the PC version)
prone... ehh well that gives you dropshotting, and for whatever reason Crytek UK took it out, well w/e. personaly I think the Black Ops diving will be game-breaking, its a terrible idea and Treyarc will be stuck with it.
easy selling? would you rather the game sell bad?