I enjoyed Diablo III somewhat, played it through once but stopped there. Wasn't overly impressed. Certainly wasn't in my top ten for the year.
What does Torchlight II do better?
I felt the character design was better, items were better, I didn't have to go to the auction house after so long to get items that would work where I was.
Plus it's like, 2/3's cheaper and made by the people who made Diablo II