Game seems alright. Not played enough to have an opinion either way, but first impressions are good.
The 3D is great as expected but suffers some slight artefacts here and there. Overall I was more impressed with Crysis 2 in this regard, but I've read that you can adjust it in this game so I will play around with it. No eye strain so far.
The gun - bloody hell it's hard to get used to it. Wildly swinging around at first. I've played probably an hour so far and I'm warming to it. It's really beginning to feel quite natural. As though you really are running around with a gun. Some moments of greatness scoping, but I'm still a bit too fresh to feel completely comfortable with it. I think after some more play, it will become second nature. I already feel like I'm actually shooting people, in a sense that's difficult to describe. It feels dangerous, almost like the illusion-breaking barrier of holding a controller is suddenly gone, and s**t just got real. I'm walking around in a computer generated 3D world carrying a gun, and people are shooting at me. The force feedback when you pull the trigger is a nice touch. Basically I'm quietly confident that this is going to prove an amazing device for playing shooters.
Just don't let anyone take a picture of you sitting on your sofa wearing 3D glasses and looking down the sites of a plastic assault rifle pmsl.