Shadow Priest was very nasty some years back, but thankfully Blizz nerfed them, Warlock was never a match for a Hunter. If you saw todays BG-s every second roll a Hunter again, they are not that good since back in Cata days, but way better than anywhere in the last 5 years.
Arcana Mage also often chosen (but who am I kidding they are 2 shot at max) rogues only give you trouble if at least 3 or 4 want to kill u, and Warrior... oh pls, Which gets to the basics, Druids, Palas, Shamy u can't kill by yourself they just heal forever.
I had a duel with a Druid some days ago down in Arathi Basin (the BG yes) we try to kill each other at least 30-45 sec and we can't. I rolled a ret pala the very first time. Very balanced game...
I found this thread but only ask about three class, btw, i had a tournament lvl 39 in two weeks (by xokas, maybe u know him) and i want to play THE BEST class 1v1 in this bracket (tournament is 1v1), so, in ur opinion, which class is the best in 1v1 by far?