Draenei shaman, TBC 2.3.
My very first WoW character was a dwarf priest, which I enjoyed immensely for PvE, but after a couple of battlegrounds I gave up on PvP. Later on, I tried a shaman which I quickly hated in PvE, and before I deleted her, I decided to try a couple of battlegrounds just to see if the experience was any different.
The rest, as the saying goes, is history.
I still have that dwarf, a crusty grandfathered enchanter, and that original 39 (now 19) shaman. If 19s ever live again, she may yet come out to play.