Well to me, I think crysis does get a lot of shit, and it was one of the rare games I actually finished.
It would be over the average on my list. Not the best game, but definitely worth playing. Of course, it would be lower on my list if the graphics were complete shit, but nonetheless, the gameplay isn't as bad as people say it is.
The main thing I loved about it is how you are free to choose your style. You can either rush with speed, sneak with invisibility, camp with armor, etc. Also, I really loved the gun customization.
I agree with Loginer to some extent, but thing is, first of all, in many cases, you can actually skip the killing and run through some places like a pussy. Also, the fact that you can actually try different methods of killing makes it slightly less boring. Of course if you always do it the same way, it won't be fun, but if you give yourself a challenge, it gets pretty exciting.