Agree.
I thorougly enjoyed the first half of the game.
There was something incredibly liberating, challenging and just plain fun about planning how you were going to assault an enemy base. It was this freedom - and of course the actual fun of executing it - that really gripped me.
The suit options is brilliantly implemented and I just love what it allows you to do. Nothing quite like stealthing up on some enemies, and thiking: "Right, I'm gonna grab this guy, run out the building jump up and throw him through the roof, stealth and hide, wait for the remaining enemies to group and suprise them with a grenade followed by speeding up to them and smacking them up"
You get the idea. I loved the fun in approaching the set pieces in the way I wanted.And then things started to go downhill.
Inside the mountain was graphically amazing, but simultaneously one of the worst gameplay experiences I've had in a while. It's simply not fun being disoriented whilst fighting extremely rubbish floaty things. I got a headache. It really, really sucked.
And from then on it was more of the same. Far, far more linear, and almost made the suit controls redundant. That flying mission sucked. Well, it was OK but not great.
The cinematic qualities of the later stages in the game were undeniably great, however. I definitely enjoyed it. It just frustrated me that the gameplay took such a huge knock since I enjoyed the earlier parts so much.
Needless to say, Crysis is still a very good game, and the graphics (provided you have a decent rig) are truly stunning, and I admit I did spend a lot of time just saying "oh my god" at the screen.
I wont be able to try the demo for a while) 
