To those who've quit: What would make you come back?

I know nothing about the game, but I bet it's the kind of game that's overhyped and will be forgotten in 5-6months.

You have to consider the standing power diablo 2 had. I'm not saying it's gurranteed that diablo 3 will thus default to that power, but considering the entire goal was to keep the same basic concepts in D2, I wouldn't be quick to make that judgement.