I know that feel bro. PVP is a bit broken overall, for sure. As this thread started with ele shaman and how tragically gimp they are (not just in comparison to the OP classes, but overall)... I wanted to go back to this:

This was me 3-4 months After wotlk was released. Brand new to shaman pvp, I'm 1-2 tiers behind the current pvp gear, still in some pve and lvl 80 quest junk:
https://www.youtube.com/watch?v=uxBLhlxii68

FS+LVB overkills. Chain lightning globals. Forgetting that it was a mediocre game and most people weren't fully epicced in s5, it actually felt like I had four ele shaman.

In MoP I was in 90 BGs about 12 days after release. I feel like I'm playing one of my wotlk shaman. When I'm not cc'd and dead.

Arenas, I've only done a handful but essentially - one shaman explodes instantly, healer cc'd, others die. Games 15 seconds. I think I got a lava burst off in one game... haha