I think the problem is just as bad for the fighter or paladin who gets haste cast on him. By level ten, characters seem to need to have AC 26-30 if the bad guys are going to ever miss them without power attacking. Usually in 3.5e, characters seem to get AC in a few ways:
The fighter/mage
+2 Mithral chain shirt, +1 shield, shield spell, 18 dex after cat's grace, amulet of natural amor +1, ring of protection +1, haste
3.0 AC 36. 3.5 AC 28. (effective 26 against hasted enemies)
The Paladin (or cleric)
+2 fullplate, +1 large shield, shield of faith, haste
3.0 AC 30 3.5 AC 28. (effective 26 against hasted enemies).
The "I've got enough AC you probably won't power attack"
+1 fullplate, shield of faith, haste
3.0 AC 26 3.5 AC 24 (effective 22 against hasted enemies)
Without Shield of Faith: "You might miss if you power attacked"
3.0 AC 23 3.5 AC 21 (effective 19 against hasted enemies).
Whereas in 3.0, it was possible to pump up a character's armor class at high levels, it appears to be far less possible in 3.5 unless something else is changed.
This is a change in favor of the "crank up the hit points, max out your strength, rage, and hope to kill it before it kills you" fighter/barbarian that is already the most effective destroyer class in 3e. Hopefully, other changes that we haven't seen yet will help to retain variety among viable and effective fighter types in 3.5e.
(It's significant that the reputed changes to buff spells (+5 to stat, 10 min/level) also favor this class as strength increases yield exponential damage increases with no cap but dex increases yield arithmetic damage decreases (AC improvements) and are capped by an armor's max dex bonus).
Skaros said:
True enough, although I wouldn't mind terribly if the defensive abilities were checked a bit, causing wizards to rely more on their companions for protection. Maybe I'm a bit traditional there though