They need to fix:
Recoil, accuracy (you shoot like you we're a part of the paralympics or something, you are an ELITE SOLDIER for crying out loud, even I could shoot better in the military), movement (they've drawn the differences in moving sideways/forward etc too far), weapon switch time - dropping the gun (itll still hang on your torso), throwing a grenade and picking it up again DOES NOT TAKE HALF AN HOUR! Also the ladder climbing is pretty retarded, if you first start on the last part of the ladder, and someone is there, you can't turn back, drop down or whatever, which means you are dead. The death/damage-radius of a frag is also ridicilously low. Oh and all the bugs... Like the heartbeatsensor bug etc.
Fix this and it'll be one of the sweetest games out!!