MP regen is awesome.

Other MMOs make your character sit, drink or some other nonsense. I don't care if it's more "realistic": I leveled a spellcaster to CAST SPELLS, not wave a stick at enemies on end.

The new mana regen actually allows me to cast spells without worrying about running out of mana every 5 minutes and having only a 10 minute cooldown to reacquire it.