Played through Crysis completely at least four times (usually with a GPU upgrade). Each time it gets better. The smoother the game runs, the more fun it is.
Also, if you think it's boring, you are not playing it the way it was meant to. You have to be very quick, moving from cover to cover, rapidly changing between suit modes. Forget his name, but there's a guy on youtube who made a couple videos demonstrating this play style. So much fun like this and actually requires a fair bit of skill to do.