I'm not really sure Diablo counts as an RPG. It's more a hack and slash. Compare it to, say, any DnD-based game, and it lacks any complexity at all.Draech said:SNIP
I think there is a problem in that the genres of hack n slash and RPG are increasingly getting molded together, when really they are two completely separate things.
Consider how different DnD games are, and then consider Diablo. Even Dragon Age was merging the two, with abilities on a timer. Putting things on a timer means you have the tactical consideration, once, of choosing when to use them. Making you pre-select certain abilities before an encounter, and then further restricting you from using them again, means that you have to make tactical choices throughout each encounter.