I've got a few hours in. Not a bad shooter, I'm not that big a fan of single player ones. I see Crysis more as a tech demo.
The graphics are by far the best I've ever seen on PC - it's not even a close call.. and I've only got them on high. The environments are just drop dead gorgeous. I'd love to see something like ARMA style MP using this engine. Once we do have the hardware to provide grass hundreds of meters out, realistic shooters will really come into their own. The level with the alien things rummaging through the high grass was exceptional.