I actually enjoyed Crysis and Crysis Warhead. Things got kinda funky, especially Crysis during the second half of the game as all the pretty graphics are kinda wasted when you're indoors and certain abilities (like invisibility) are worthless.
I think people's biggest beef is it made their $4,000+ computer feel like the horse power of a Wii. If they can get the engine tuned so it gives pretty graphics on a beefy system and scales well with older hardware, they'll have a winner.