DeathSpank
Though DeathSpank reviewed well, I was a little concerned about it being yet another single-player Diablo clone. Fortunately, it has a flavor all its own, even putting aside the thick, deadpan humor (and absolutely amazing voice acting, at least for the hero himself). DeathSpank is really more action than anything else, and while the pause menu makes the RPG mechanics look deep, treating them like a side dish to the button-mashy main course felt surprisingly good.
I'll definitely get this, at some point. Pretty sure it'll end up on Steam eventually.
Progress: Killed a whole mess of Greems (?) in the demo