I grouped with a pug for Slave Pens yesterday and learned one thing about my new build and gear.  With all the +crit % and +int I didn't have before, I'm going to have to learn to be a LOT more careful with pulling aggro.  (Not that this isn't something I already had to work on anyway...)  I suppose it would have worked better if the mt would have stayed on the target he or the hunter initially tagged, and if everyone else would have used /assist.  BUT...  While questing I'm seeing crits often and they're bigger than I've ever seen.

PS:  That pug was very depressing, and I waited in queue for it for about 2 hours to boot.