Crysis 2 = badass
Unless players are tagged or spotted going into cloak, they are very hard, almost impossible, to see from long range. Using an assault scope on the SCAR (giving you 3x zoom), or using a sniper rifle can help some, but it is still hard to see them. Armor slows you down, but using it will help you win a lot more one-on-one fights.
Overall, the multiplayer for Crysis 2 is hard (especially starting out playing standard), but extremely fun. Anyone who likes FPS games needs to get this one.