One of the best first-person shooter on the market so far.
First, the gameplay; The nanosuit is what makes Crysis' gameplay so special. It makes you feel like a superhero but far from invincible and opens many options on how to face a situation. You can sneak in and out of view, killing all your enemies one by one using the Cloak mode, you can jump on top of a building, blow up the roof with Maximum Strength and toss a grenade, or simply use your maximum speed to run past them, using the leaves as a cover.
Now, the graphics, they are simply amazing, but to run them on Very High, yes, you need a very powerful rig that can go up in the $2000, but with my current system, AMD Athlon X2 3600+, nvidia 7900GT and 2gig of ram, the game runs smoothly with most of the settings on high and the rest on medium.
I won't give any spoilers, but if you want a game with a solid, interesting story-line, Crysis is exactly this. The only thing is that if you play on easy difficulties, the AI isn't exceptionally good and the game will be easy to beat. Playing on harder difficulties will make it much harder and the AI will react much more realistically to your actions.
The Multiplayer is very fun to play, though PunkBuster is rarely doing anything and you are likely to encounter many hackers that will spoil the fun. But if you manage to find a game with no one using hacks or exploits, it's pretty much like a Battlefield game, but much more fun.