I m a casual random BG PvP. Never got into arena or rated BGs. I ve at one time or another 'mained' rogue, hunter, feral druid, frost dk, warlock and mage.
I see a lot of posts basically saying - hybrid dps/healer have way too much healing, healers are unkillable (unless its extremely well coordinated - not going to happen in a random BG) and mages are way op.
Unfortunately this is my exact experience since the new patch.
Despite all this QQ I m not sure I see any comment, denial or reassurance by Blizz. The lack of any comment just feeds doubt and insecurity and unless you play mage, hybrid or healer a certain depressed resignation.
I suspect in major rated / arena its probably workable around but for the chaos of randoms it isnt - so for a significant number of players we will try one of the above to get some enjoyment in BGs and WoW will be the worse for it.