OHAI, title explains it. What is your least favorite class / race combo? Can be an old combo that you just hate seeing, or maybe the new CATA ones.
For me, I've always HATED Nightelf Hunters. My main has been a hunter since mid vanilla, and they have always just made me angry haha. I started off as alliance, (DWARF HUNTERS REPRESENT!) and literally whenever I would be grouped with a bad hunter it would be a nightelf about.. 90% of the time. (Yes yes Stereotypes are a bitch eh?)
And when it comes to the new CATA combos.. I can't wrap my head around an undead hunter... It just doesn't feel right to me. Kind of the same feeling I get around undead priests haha.