I'm rank 51, I have the 10% expertise, I grinded tons for the champion gear like thousands of other players did (and thousands more and currently doing).
I lose some fights. I win some. Both aren't disproportionately unequal. We should all expect to lose sometimes. If I won NOTHING then I would question why not, I would think I was a bad player entirely.
I have a server with more Imperials and less Republic. Since the patch I cannot get WZs as much as before, but hey, better than beating on some low levels as many would argue.
I just don't see the whole class imbalance thing people here are complaining about. I see posts where the OP is frothing at the mouth like some rabid mutt.
I'm not the perfect player, but I still have my moments where I play very well. Likewise I get out-played by classes of all sorts.
Juggernauts kill me. Marauders kill me. Sorcerers kill me. Scoundrels kill me. Assassins kill me. Heck everyone kills me, even in 1v1! And yes, playing so many matches, and doing those Ilum pvp armament dailies, I have had plenty of 1v1s.
I realise the vast majority of the people on the PvP forum are a small majority of disgruntely players by-and-large.
I suppose the point of this post is a hope that you might explore reasons other than mechanical imbalance as to why you're not performing as well as you might.
FLAME ON!