I played the open beta, which is really more of a demo. Unfortunately you really don't get far enough into the skill/rune system to experience any interesting choices or whatever, but it does seem reasonably deep and accessible (and I definitely had more powers at level 10 in D3 than I did at level 10 in D2). It seems like they overreacted to people bitching about how colorful the original previews were, because Act 1 looks like it's taking place at midnight during a goth convention.