The top of my personal list of concerns is the wow po of crowd control in PVP. I feel like as more and more CC abilities have been added to the game over the years, things have gradually gotten out of control. My big objection to having so much CC in the game is that the more a player is CCed during an engagement, the less their skill as a player as an opportunity to affect the outcome of that engagement. In my opinion, no one should ever be chain-CC-locked while they or their partner is burned from 100 to dead, because when that happens, how much did their skill as a player really matter?
There is, of course, a degree of skill in both using and avoiding wow gold, as well as knowing when to trinket out of it, which is why I feel everyone should have at least a little bit of it to use in critical situations. But it should be on a fairly long cooldown; using it should be a real choice that players have to make, and using it at the wrong time should hurt their chances of victory. I don't think spammable CCs should exist at all, quite frankly, because it leads to people spamming them by default without really having to put much thought into it beyond choosing a target for it.
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