I mean that seriously, an AP's biggest weakness are warriors.
Hero warriors likely have perfected both their weapons and the AP's so they parry them very effectively.
Warriors dodge and A-P's don't. If an A-P switches to a shield then he is giving up half his damage output from dual wield.
Bloodthirst haste negates the advantage of bloodlust haste
rager resist roughly equals shield + aura so the dam redux does tilt the AP's way a bit
Warriors tend to have better lag/direct damage options than A-P's since spellbane turns most of their spells. Additionally AP weapon skills are weapon specific and its not practical for an AP to switch weapons in combat so while they have a lot of general utility they are generally pigeon holed into a couple strats in individual encounters.
Deathblow, yeah it rocks when it lands, AP unholy control though might do a little better damage wise in a lot of fights though as it is unblockable so more consistant.