It's not easy.
That's the first thing you got to remember.
30,000 team in 2v2... Those with 1500 rating are in the top 10,000. The average WoW player isn't capable of keeping a winning record, much less one above 1600, 1700 or dear lord, 1800+.
It's part of our culture and nature to only respect excellence and put down anything that is average or even 'good' - we only care about Great.
So no, it's not easy.
For starter - the gear level of Arena player has gone up a lot since S1 and even the start of S2. You're simply not going to burn through the ranking with blue weapons. Gotta give it time.
The 2nd thing you got to accept, is that if you want to win, and you want to be the best - you've got to make sacrifice. How much you're willing to sacrifice is up to you... but I'd start with the easy things -
Are you teamates as good as they could be? Are you with them because they're 'friends'?
What about you? You play with what you like and find anything you don't like to be 'inferior' in some way. You didn't want to be Combat when Combat was strongest and now you don't want to be AR/Prep. Why?
Bite the bullet. Winning with a spec you 'hate' ends up being a lot more fun then losing with a spec you love.