The problem is they spent so much time re-working the old world and making people's abilities and spells able to blast through the old world, they didn't care about the collateral. At the moment, I am currently leveling a Rogue and a Priest both solely in BGs and I know how frustrating lowbie BGs are.
Especially since in the beginning lowbie brackets half the roster is usually Hunters/Rogues. Twinked out 14s are looking at 1300+ life and being unstoppable killing machines.
A lot of the newer type of players would rather prefer this type of game play because one shotting is fun for some people. Me, I don't care for it but PvP leveling is just another option to level and you need very thick skin and patience to pursue this option. I definitely don't recommend sticking around lowbie PvP leveling if the lowbie bracket is annoying you
It only gets worse when Rogues get their Vanish in the 20s and Hunters Aimed shot starts literally one shotting people in the 20s. I remember in the 20s on my Full BoA Disc Priest, geared Hunters could one shot people through my Disc Specced Bubble.. it wasn't exactly the most fun time.
As much as this would hurt me as well, a change I wouldn't mind is this:
"If you're wearing BoA or enchanted gear, you automatically will be queued up with the Twinks in the twink bracket. However, you may continue to gain experience while people with their experience off will not."
It would suck for those who enjoy facerolling newbies but it's an option. Or perhaps an option as to where entering BGs would scale down your BoAs to normal greens at that level but keep your experience gains the same. Either way, I honestly don't see them doing much to lowbie PvP so it's just one of those things you have to tough out.