Stop complaining and giving feedback.

There's no point. Track record:

Community: BM Hunters do too much DPS!
Blizzard: No, they don't.
Months Later: BM Hunters do too much DPS. /meganerf

C: Ele Shammy DPS is unbelievably bad.
B: Our internal testing shows that it is fine.
ML: Ele Shammy DPS is unbelievably bad. /buff

C: Retadins have infinite mana and "ROFLSTORM" everyone in one hit.
B: No, they don't. We will not be nerfing Paladins.
ML: Retadins have infinite mana. /nerf x 2

C: Holy Paladins have infinite mana.
B: We will be looking into balancing mana regeneration so that all classes are on equal footing.
ML: To correct the problem, we are nerfing Imp Water Shield, Spirit-based mana regeneration, Lifebloom, Serendipity, Priest clearcasting, and Rapture. This obviously puts all classes on equal footing. Really, we didn't miss anything.

C: No healer can survive in PVP unless they have an immunity bubble.
B: You'll be fine once you get more resilience.
ML: Since Paladins are the only viable PVP healers, we are going to buff them. In addition, we are adding Improved Barkskin and giving Riptide a new icon. Have a nice day.

They're just going to do what they're going to do. Show your extensive/compiled arena statistics. Show videos of keyboard-turning spell-clicking pallies who have no idea how to play reaching 2500. Show your WWS reports of hundreds of raids from dozens of guilds and how much DPS/healing/whatever is going on. None of it will change their minds.