I'm about 60 hours into it now, playing a Duel Wielding Summoner Outlander on Elite difficulty. Haven't even reached Act III yet!
Sure, Torchlight II is entirely derivative and virtually free on any new ideas, but it's so damn well executed that it's almost impossible to call it out for that. It's fast, fluid, and feels like it's just itching to let me have fun.
For comparison: I logged into my friend's Diablo III account and finished the whole game in about 6-7 hours. It's was the most boring ARPG I've ever played.