Haste is so overpowered compared to other lvl 3 spells as it is. People treat Wiz's and Sorc's like haste bots.
My understanding is a 10% overall increase to melee speed across the board and a 15% increase with haste. That sounds good to me, we can get our attack rates close to where they were unhasted. In the end I guess we will be losing 10% attack rate while hasted but we do get +5 and +10 attacks earlier so maybe the whole thing averages out in the end...