So here's my two cents on the game after having a few days to cull my thoughts together.
It's easily the most fun I've had with any of the "next gen" games.
The gun play is solid, and very reminiscent of COD4.
Using the jet pack/wall running is fun, and if used properly can give you a big advantage over people who play the game as if it were COD.
The titans are tuned just right. Powerful, but not unstoppable by any stretch of the imagination.
No matter what some of the chumps on gaf would have you believe, team play is very important.
The maps are well designed.
The NPCs are worthless. I know they're supposed to be cannon fodder, but their are times where they will stare at you for 2-3 seconds before firing on you.
Uncertainty regarding the "Azure" platforjm. I'm hoping we don't have more of the server issues that propped up on the second day of the beta.
The beta is over, and we have to wait a few weeks to play again.
All in all, I think the game is fun and should be a fairly big seller for MS. I don't think it'll be the massive system seller they'd like it to be, but that's mainly due to it being a multiplayer only game.