Dust, an Elysian Tale fits your criteria.
You could try Bastion. It's got kind of a Diablo 3 vibe to it, although it's less of an RPG I guess.
HOB and Hyperlight Drifter are more Zelda-like experiences.
Incredible Adventures of Van Helsing are VERY diablo-like experiences.
And you could always play TERA. It's an MMO, but you do tend to kill lots of enemies all at once.
I don't know, I'm just throwing out ideas of things you might enjoy, despite not really being Diablo-style looters.