That said, Crysis is definitely one of the better shooters from the past years. It looks gorgeous and the gameplay is fairly varied. Most levels give you multiple ways to approach a given situation. I'm going to go against the grain though and recommend you start out on a lower difficulty. Part of the game's appeal is playing around with the environment and your different powers, which, while not impossible, is a lot harder to do when enemies can kill you very quickly.
Also if you enjoy Crysis consider buying Warhead as well. I'd say it's actually superior to the original game, though quite a bit shoter obviously.