Camping
The cloak makes camping ridiculously easy now. The cloak is also pretty much mandatory for moving around the map and this isn't good for a run&gun game. It seems a lot of my kills have been gotten from bumping into people in stealth.
Nanovision
Crysis looks good on PC. Nanovision ruins this utterly. Having to constantly switch in and out of nanovision to catch cloaked players is not fun combat nor does the game look very good in nanovision. Furthermore, nanovision has to harsh a penatly by draining energy. The nanovision has a clear disadvantage where it can't be used at long range to spot enemies, so why it drains energy is beyond me.
Cloak
This is simply to powerful and lasts far too long for a run&gun game. It's not fun and it's very hard to spot.
Suit energy
It is not fun to feel completely vulnerable everytime your suit needs to recharge. If nanovision did not cost energy this wouldn't be too bad however, it does and feeling utterly vulnerable is not good.
Map Flow
Cloaks adds constant paranoia and this isn't good. Good multi-player FPS games have map design where you don't have to constantly check 360 degrees around you. In Crysis I do feel like I have to and the cloaking does not improve the situation.
Overall
The suit feels simply too powerful for multiplayer. The suit takes you from one extreme to the other constantly. You go from super ninja who is nearly invisible, to armoured tank far too quickly. The playing field never feels equal and it s far to easy to kill from surprise in Crysis 2.