Not what a first person shooter should be...
First off its a very loose first person shooter. The way you pick up weapons and grenades is just plain useless. I am constantly in a firefight and have to bend down and look for weapons to use and then hit a button to pick up more ammo. OK this is great if you wanna be ultra realistic, but honestly who thinks this game is realistic anyway. This causes the shooting part very frustrating and therefore not a fun shooter.
Secondly on the first mission or so it seemed silly that I had to search for an appropriate weapon to kill a tank. No amount of grenades or weapon fire or attempting to get in the tank worked. Weapon fire is understandable. But there is always always always a weak spot on a tank for gun fire and grenades will eventually destroy a tank. BUT NO; you must find a rocket launcher; which the game doesn't help you out with finding in the event you spend 10 mins attempting to find it. Once you do find it, it takes 3 missiles to take it down. EVEN AFTER I used 5 grenades on it; no f'ing way.
Lastly the "super powers" of your nano suit are pretty much useless, they last so little time that you can rarely do anything with them. I really believe that whatever "power" you choose it should be pretty much indefinite; well except cloak which could be abused. Ok for example you could activate speed and move from one space to the next easily without having to wait for it to recharge. Or strength to punch punks for however long you want, or armor to reduce weapon dmg while equipped. Why you can only take about 10 bullets and then the armor is gone, is beyond my comprehension. Especially since Koreans with nano suits can take a rocket to the face, grenade and a clip of bullets will remain standing...when their suit glows red (strength) WTF.
All of the above mentioned reasons makes me really dislike crysis, its no fun to die constantly or have your suit powers run out so fast you can't even use them effectively.
Fear is still my number one sci-fi shooter.