I got it for Christmas, amazing game. Beat it in about 6 hours (playing non-stop) on hardcore. Such a great game, I wouldn't be surprised if it got Game of the Year.

Anyway, the hardest part for me was RAAM, all the berserkers are a cinch once you understand how to kill them; it gets you going though, regardless of how simple they are.

Myst, how the hell did you beat it on Insane! Good lord, you're a beast...

I'm gonna go play right now. Also, if you have XBL, post your gamertags up so we can play on Live together.
My gamertag is firetap
I only have XBL Silver though (I may buy Gold soon) so I can only play on weekends.