I have two characters, a pve rogue and a pvp hunter.
Needless to say pvping on a rogue is ridiculously stupid, while hunters are mostly bottom of the barrel on dps. So now to get my rogue's legendary questline continued I have to do pvp while wearing crap blue pvp gear and my pvp geared hunter who doesn't care about sha gems has nothing to benefit from the new faction.
Oh boy such good game design! At the very least they should've informed us of this before MoP