It has already been posted, but, just compare the new Haste (third level spell) with some others.
*1/round per level, +4 AC, +1 attack, perhaps speed x2 (don't know for now)
The attack is pretty useless for a wizard, cause he will miss most of the time. The hypothetical extra speed may be more usefull, as is the AC boost, but the duration of the spell...well
*Mage armor wizard/sorc1
1hour per level, +4 AC.
*Shield wizard/sorc1
1minute/level +7 AC, + save bonus
*fly wizard/sorc 3
10 minutes/level, speed x3 (or more for halfling), surest way to escape melee attack
*Blink wizard/sorc 3
1round level, 50% miss chance, allow to pass wall or closen door, negate dex bonus to ennemy AC, half damage from corporeal source, allow to strike ethereal creature...
Haste was a useful spell, with a drawback : the more you cast spell per round, the more you lose spells. A fighter has an infinite amount of attack, you don't. Now haste is useless for a third level spell if you compare it with Fly, Blink, Mage armor or Shield. The right solution would have been to give an extra move, plus it would have been far more consistant with the spell's name. Now, just call it frenzy.