5.6m has nothing to do with the game is old, it dropped cause it's overall crap.
I loved end of wotlk, Cata and MoP, especially MoP in terms of pvp fun factor (3dps arena for the lols was fun yes). Actually I love it when expansion is at the end, usually it has been many patches that fixes classes up, and I don't feel so stressed in gearing fast fast fast.
How fun it was to be on my druid for pvp (MoP), where I could buy gear for feral/balance for honor after I capped CP for my restogear. It was so much to try out, so many alts, and I felt all classes was in a good spot.
WoD is fucked up in the pvp department, classes are gutted, pruned important shit from classes that needed it, and gave it to those that did not need it.
I realised too late that WoD is all about raid, which I am actually having a fun time doing now, but outside raid? Shityard and the gay shit called garrison? The retarded state of pvp? Yes this is really bad, and the numbers don't lie.