Imagine shitton upon shitton of feedback threads, messages etc. etc. from shitty pve'ers. Now there is this one good pvp'er that actually cares and gives feedback like DroonX, but his comment is a needle in a haystack (read pile of pve shit). Even if the entire pvp community would give the same feedback. They would still recieve over 20x as much feedback from the pve community on stuff..
You may have a point, which is why I've just come to accept it after all these years.
However, that doesn't cover how something like this WoD launch can make it all the way to live.
Take season 5 shadowfrost for example (if you've been around that long). That's the type of thing I can kind of see could get through beta testing (still somewhat retarded though if tons of people are laming the same thing, it's like they're not even paying attention). It was an unanticipated combination of things that allowed that to work, especially considering the stupid shit like using that blue level 30 something mace that had a mace stun on it.
Some issues, however, are another animal entirely. Early WotLK burst was a good example of this, and current self healing is also a good example. These are things that ANYONE who has absolutely any knowledge and experience with the game could identify literally immediately, by themselves, no feedback needed. That stuff like this goes live every expansion merely speaks to the mind-blowing incompetence of the devs in charge of making this game.