Well I've only played for an hour but can I just say..
"WOW" at the production values, the graphics are sublime and easily the best on the PS3 and right up there with the very best the 360 and PC have to offer.
Having said that, I haven't played much game yet, but the fact that the gameplay when it does kick in is so utterly seemless from the beautiful cutscenes really has taken my breath away.
Oh and what's with all the camera angles in the cutscenes carefully positioned so we can get a beautifully lit shot of snakes tight ass ?
Seriously though, yes I am impressed so far. Only annoyance for me was clearing up my HDD to get more space, but that's not the games fault really.
Great stuff. Hopefully it keeps me hooked as long as the wow factor remains throughout.