I spent a good 5+ hours playing this game so far and I have to say I'm very happy. The game is pretty much everything I could have hoped for. They kept true to the roots of the gameplay, added some really cool tweaks and features (jacking is just friggin' awesome), improved an already superior AI (the first time an elite jacked me in my tank my jaw dropped) and its a truly beautiful game. I also like the added emphasis on melee combat and timing, which makes sense considering how close quarters a good portion of the combat is.
There are some problems with the marine AI, mainly pathfinding issues, but they are minor. Also, the game ain't easy, even on normal. I'm stuck at one point and I want to pull my har out, but that is an issue for a spoiler thread
