The games called "Diablo" are considered Action-RPGs.

They lack some of the things original RPG games have.

Interaction, for example. In the above mentioned games, interaction is greatly reduced; instead, the game focuses on combat.

Even the quests are only solvable via combat.

When you find a big kettle of crazy, it's best not to stir it.
--Dilbert cartoon

"Interplay.some zombiefied unlife thing going on there" - skavenhorde at RPGWatch