I just finished Bastion yesterday and started Dungeons of Dredmor.
Bastion is very pretty and has awesome music, and the narration hook is fun. The story didn't wow me as much as a friend promised, and the gameplay is a bit stodgy. Not a bad game if you want to kill 10 hours on the cheap, but not great either.
Dungeons of Dredmor seems like a good intro to Roguelikes. I'm not too far into it. I kind of wish it didn't have the option of reloading saves, since I'm relying on that heavily now - my current character has died 3 or 4 times on the first 2 dungeon levels. I may reroll soon and click the "permadeath" option from now on.