I second dungeon siege 3. it ran well, that's all i could say for it.
Another diablo-like - path of exile. Really like the leveling up system, nice and different, and how you obtain abilities, but the gameplay is mind numbingly easy (it might get harder at some point later on, but it takes far too long to get there if it does).
final fantasy and similar grindy rpg's, though i loved final fantasy tactics, one of my favorites even, and managed to make it like halfway through ffxii before i got bored. Yet people keep convincing me that *this time it'll be different, you'll like this one*, hehe.
I actually like the bethesda games (though i heavily mod them). If ya tried but didn't like oblivion, try it w/fcom convergence (have some patience in installing it though, its a pain to get it going) + whatever other mods catch your eye (the trick is to only get mods that up the difficulty, don't get anything that makes you superman or you'll get bored after 5 minutes, even if it looks flashy and cool). If fcom is too much because of the installation process, then oscuro's oblivion overhaul instead (double click to install). they both have youtube trailers to explain what they do (fcom include's oscuro's and other overhauls and makes them compatible).