I had the feeling that Blizzard was aiming to simplify gameplay to better appeal to the moba crowd with WoD. I wasn't sure that it would be such a bad thing at the outset, in hindsight- that concept really cannot apply to the MMO platform. Arena has no draft pick, 3v3 is kind of too small a bracket for draft to necessarily solve the problem even if they added it- and most importantly many players don't have the time or desire to learn and upkeep several classes to have the option of multiple picks anyways (me).
Post is heading in the right direction though. While warrior felt "cleaner" with the simplifications it received moving from wrath into cataclysm (and a similar feeling occurred again, transitioning into WoD from mists- not that I've played much of these last two xpacs at all), it also felt less rewarding. I think Blizzard needs to find ways to make those QoL changes where they're really necessary (e.g. removing hamstring from GCD as they did, and fixing charge jumping), WITHOUT baking the hell out of the abilities just for the sake of removing buttons.
Cataclysm for me struck a balance between fun and "well this is easy, watching hoodrych on stream is like watching myself play" (<--- very much unlike when I played in wrath), WoD, for what little time I've spent with it has been both frustrating (feeling out of options in certain scenarios) and overly easy (got my first glad title and played very casually, not having to practice my class much but rather trying to just direct the overall strategy). In-fact, getting gladiator in WoD S1 felt SO unrewarding even as my first title that I couldn't be bothered to go through the strain of trying to find partners and organize play times again for the second season after that ridiculous gear re-grind and with such a small population of arena-players to choose from.