Yes, I heard they were going to, with the new expansion, do something to bring actual stat numbers down to Wrath levels.
It's like, when BC came out anything less than Naxxramas tier sets was worse than the quest greens you got in the first zone, so you went in like 20 minutes from looking like a god of war to looking like a level 30 dumbass.
Then it happened again in Wrath but to a lesser extent as I remember. Also the gear looked better in Wrath, as I remember the quest gear started conforming more closely to the "sets" that random world drops used, so your guy looked more coherent.
I never played Cata but things got really out of control after that point. By Panda the progression system pre-85 had fallen apart completely, the dungeons they worked so hard to redo in Cata could be done by two or three people (I remember our tank soloed one of the bosses in Scarlet Monastery when he activated him before we got there and got us locked out), and all those zones they remade were mostly ignored because it was faster to just spam dungeons full tilt.
And Pandaland characters had millions of HP and could hit for three or four hundred thousand damage and the numbers were just such a mess.
It also broke PvP since stats were so inflated a character needed to be able to more than his own HP per second, so they added in resilience and power but since (when I played) the best PvP gear was like 520 and the best raid gear was over 600, and everyone had automatic PvP resilience even if they never played PvP, a few guys in raid gear could easily kill dozens of fully-kitted dedicated PvP players in world PvP (It was better in battlegrounds because battlegrounds forced gear down to 520 ilvl without giving them the PvP power they'd have with 520 pvp gear but battlegrounds were very much their own disaster in and of themselves)
I haven't seen the Horde win Alterac Valley since Burning Crusade. That and Isle of Conquest the alliance basically always wins, probably because they're not actually PvP, just mindless races to kill a PvE boss, and also because 90% of Horde players on those maps are bots. An organized group of just 5-10 dudes can easily win AV by themselves by defending Galvangar, like I said the BG is just a mindless zerg, they have no coordination and if you put up a fight they just give up.
But we have a consolation in that the Horde never loses any of the other BGs except Kotmogu. Strand of the Ancients and Silvershard Mines in particular the alliance almost never wins.