It's good. It's definitely good. A little slow-paced at times, especially when going from place to place. I keep trying to activate my cloak.
Sorry, just not as pretty as Crysis:WH. It beats out CoD4 for sure, but not Crysis. They did an excellent job of it, but I'm going to go with Fixt on this - it's just not quite as "3D" as Crysis:WH. Mind, there's a reason my framerates don't drop below 45, even on 1080p, all settings maxed, 4xAA. Seems to be loading up all four of my cores fairly well, which is another thing that impressed me. So they definitely get props for their work.
On the other hand, it's definitely going to need a patch or two in the near-future. I'm getting periodic freezing that alt-tabbing out of the game fixes. Video card memory leak? Dunno. Kept exiting the game the first time I tried to use the bus system too. But it could've been much worse.
Edit: Oh yeah, that's the other thing that I'm really liking - the wind and weather effects. They did a great job on those, although they don't seem to happen very often.