I'm a MM Hunter and have not had any problems defeating any class in PVP 1 on 1 at equal level.  Feral Druids seem to get a lot of love from many ppl I have spoken to and I will admit they were very tough at first, but once I realized the trick is to keep them away from and perfected my kiting, they aren't a prob.  The biggest challenge I have is a rogue.  Those guys are tough, but just like the druids: keep them at a distance and a hunter can own.