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Theres quite alot of customizable features in Diablo III when character creation is prompted. The five available classes allows you to consider what best suits your personal playing style since all of them have different skill sets and have very different builds as the game progresses. Keep in mind that Blizzard will probably if not definitely release expansions after expansions for Diablo III.
Enjoy the video. I hope the video peaks your interest in the game.
Again, open beta is available for the public.
***I do not own the video posted above***
Source link: http://www.youtube.com/watch?v=rXtew-O-h_g