Randoms are more lopsided now because the average ilevel of a random geared player in a BG is around ilevel 830. Most other players that have been playing longer enter a BG with an ilevel of 880+.
That assumes the player with ilevel 830 gear has all honor talents unlocked. In WoD, you have all your abilities regardless of gear ilevel and the top level gear was capped and scaled DOWN while low geared players were scaled UP.
But most PVE players didn't realize that is how PVP worked in MoP and WoD and assume Blizzard is right at face value without questioning their PR buzzspeak propaganda for Legion "PVP improvements".