Paladins need to be reviewed and balanced in PvP, especially Prot/Holy, which is currently far too strong.
They are extremely difficult to kill, have too much healing, CC, defensive bubbles and burst damage. In my last Arathi Basin, 7 out of 10 players on one team were paladins. When more than 50% of players in battlegrounds are playing the same class, something is clearly wrong.
Shamans are also very strong, but Prot/Holy paladins are currently the biggest problem.