Path of Exile. OK, I've only played a bit of it. I paid a US$10 beta key. For a game that is what D3 should have been. It's like a load of thoughtful gamers not obsessed with money-grubbing designed it.
Massive (and I mean freaking massive) skill trees allowing all sorts of theory-crafting madness
Nice but not OTT graphics, water effects are nice
Some interesting classes (Ranger, Duelist, Witch, Templar, Shadow and Reaver)
Great enemies (got attacked by a mob of hungry cannibals who pelted me with rocks and fire bombs
Bizzaro crafting / rune system where runes give you different skills (a bit like D&D feats) in your equipment but instead these runes level up too. So you can train runes and swap them between your equipment
Trading in the first area involves barter, your character is on a wrecked prison ship so no gold, no merchants
Music isn't bad
Multiplayer on choice of two servers, it is populated no probs getting a game
I have one beef at the moment and that's the awful mini-map, but it's still in beta and I'll be giving feedback. So, if you're after a Diablo fix (and this *is* a clone) but with a game that feels like an older-skool ARPG (esp. D2 these guys are clearly D2 fans) then this might be for you.
Recommended.