Let me beforehand say that I don't think they are overpowered, but they have just about everything going for them in a BG enviroment.
On top of that, every BG is literally PACKED with Hunters who know that they are strong in there.

The experience that this creates it that you are turreted down from all sides by Hunters and swarmed by pets non-stop, which quite frankly... is not fun.

I often hear people wanting a cap on the number of healers, which ofcourse is also a QoL improvement, but I would perhaps even more like to see a cap on Hunters per BG!