I've been playing the D3 beta, and while I totally understand that their previous rune system was too complicated, what I played today made me just turn the game off.
Basically I'm going to be drip-fed a new ability or rune every time I level. Maybe this isn't so bad on its own, but in the greater context of Blizzard's game decisions the past few years, I'm starting to worry that "concentrated coolness" is evolving into "make everything shiny and retarded."
Maybe it's just me, but I actually want a little more challenge and complexity. And I'm by no means a hardcore gamer.