Seriously though, attack speed can be abused, and can elevate paper DPS when there isn't mana regen/ build to support it. Nonetheless, attack speed is usually the best thing to add when you already have a solid cc/cd gear with appropriate mana regen, PUR etc.
With mana bonuses from health globes, and constant BBV rain dance, running out of mana is rare. Last time you clicked on a frenzy shrine, did you kill things quicker? Or do all run past them worried a Doctor will see you killing stuff quickly and call you a newb?