I'm playing Rage. I just got it for $18. It's really great. I think it deserved much higher ratings. It's the most fun I've ever had with a single-player shooter. My only complaint is that I had to delete stuff from my HDD to install it. It wouldn't run from the disc for me and I have a 20GB 360. But I have a feeling that I'm almost done with it so I might try the other good Bethesda 1st person game, Dishonored, if I can get it for cheap.
I <3 my HRAP EX-SE SSF4AE + BBCS2 + UMvC3 + MK = Life - Waiting desperately for Skullgirls