Ok , it's a Diablo clone. But it's a high fidelity clone, and that's all that really matters. It caters to two key game mechanics - kill monsters, get better loot. It has classes and skills, and even a pseudo MMO mode, but that's not what it's about. Kill monsters, get better loot.
This key formula can keep me enthralled for months.
Yes the concept is a somewhat interesting post apocalypse. Demons have invaded. From hell. It's not as ridiculous if you say aliens from another dimension? Any ways, I haven't played through the campaign so I won't give my full comments yet. I also haven't tried all three character types fully, so I'll reserve on that as well. But if you have a machine that can run it, and it's fully Larry compatible by the way, it's got shed loads of style. An loot. Lots of loot.