Everyone knows 2v2 bracket is not balanced, nor does blizzard attempt to use 2's as a model for balancing classes. On my warr I usually play with a BM hunter or Fro Mage, and on my Rogue with a feral or Spriest.
Some comps, IMO, are absolute headache and I dread facing.
Which of these comps gives you the hardest time?
Feel free to add others!