I wouldn't generalize, especially with the changes slated for 2.3.  How many times do you run out of shield block when fighting the prince? I never do as a Paladin tanking it, which I have done successfully a few times.  I am not the greatest at avoiding infernals but I do not die because the class can't tank him more because of my inability to move him properly.

Anyway, I agree currently Warriors have an advantage over Paladins tanking 80 percent of the real bosses.  But you're also not bringing another set of buffs or aura's to the raid are you?