Right now I'm playing:
Zombie Shooter 2 - An isometric-view run&gun with a few RPG like attributes. It's a great way to waste a few hours.
If you like ZS2 you should check out the
Complete Shooter Pack. Lots of run&gun fun!
And the aforementioned Torchlight. It's fun.
I'm thinking about getting this game next
Nation Red. I like zombies and guns...