i found an interesting video and screenshots about Diablo III:
You can see several debug views like Physics, Bones, AmbientOcclusion, the magical effects, smoke, etc.
Some things are interesting, like:
If you look at the bones debug view, when the skeletons die, their root bone stays where they died and the physics is applied to the rest of the skeleton, for example the one falling fown the cave at ca 2.30 playtime.
At 2:55 you'll see that they use many many quads...