The interface for the game is simple, the graphics stunning, and the mood is spectacular. When I first saw the game, however, I was disappointed. Many RPG fans complained that it took no skill to play. Well, it doesn't. The game is simple enough to get started right away.
Most people see the first few levels of the game and think that's all it has to offer.
This is not the case. Just think of the game on normal mode as a tutorial for Diablo on Nightmare or Hell difficulty. The monsters aren't pushovers anymore, and it requires an in-depth understanding of the game to be able to combat them. Blizzard has packed a lot of re-playability into this game. It might seem too simple at first, but playing Diablo on a higher difficulty setting is a whole new experience.