If you haven't tried the Space Marine demo yet, go do it!
It's free both on Steam, PS3 store and i think it's on Xbox market as well
There's 2 missions, one with full weapons choice (chainsword of course, bolt pistol, bolter, a grenade launcher and a sniper) and one with jump pack and bolter..
It's gonna be the most awesome 3rd person shooter ever, even battling Gears of War 3 (and that's a lot coming from me - just ordered the special edition GoW3 xbox)
Anyways, made this thread to make you all aware that you can actually BE a Space Marine now