then you have a mob rotating around it's rather amusing.
From my own experience, enmity merit play a big rôle on this. i gave up my enmity merit for spellcast interrupt and since then, i can get some trouble where the mob is rotating. when i had my enmity merit, i didn't have that kind of problem.
You can guess easily that having some enmity while meleeing on auto-attack (well, mostly from merit, i don't see where you can put enmity stuff without losing some power) enhance greatly your holding hate.