I'm on The Harbinger (Republic) and I haven't won a single WZ yet. Between my 2 characters I'd say I'm 0-12, but don't know for sure. I am average, maybe a little above, I'm not sure I should be around the top of the boards as much as I am. I've played pretty good, and seen good play by the others on my teams, but we just haven't won yet.
I haven't tried PvP on my one Imperial character yet, I'll have to give that a shot when I think about it.