From the very beginning Ashran is now all about joining an Instance where your team is already winning, in fact it's the only viable way to play it unless you desire to be utterly slaughtered. Basically they created a setting where only the clueless end up constantly getting slaughtered and curbstomped while everyone else will join a group that is already dominating. (In other games these people are refered to as winnig team joiners and many games try to either punish or solve this behavior by swapping around teams). In WoW this is encouraged and seen as success because only "participation numbers matter".
Secondly, if you actually engage in PvP in Ashran or actively try to win objectives/participate in general, you're doing it wrong. Just standing around idle for hours isn't just a viable option that overall nets you the very same rewards gear wise and in progress towards things such as the Nemesis quests it's actually the better way to go about it and often times the quicker way.
Why? Because Ashran severely punishes dying, something that is integral part of PvP and sometimes outright helps your group win. Blizzard meanwhile punishes you for it. At the very beginning you even got armor damage if you were in combat with any NPC at that time, now you merely lose fragments and quite likely lose out on progress for quests during your way back and rezz time but if you're after conquest you get denied that also. While people who avoid PvP, afk in the back or hold back in purpose get get to enjoy the full rewards, basically doing the very same thing Blizzard sought to prevent by denying people not being in the zone any kind of rewards and progress they ended up helping those the most.
Even then a lot of people who attend Ashran are not even part of the PvP crowd, there's a lot of PvE players who're simply after cheap, fast and easy gear who quite often revile PvP. This ends up to get so bad at times that people join groups that state that they don't do events just to demand said groups do events anyway.
So basically Blizzard build a battle ground where you get punished for actually engaging in PvP, where acting in a selfish, egoistic and vile manner ends up benefiting you hugely and that attracts a group of people not normaly seen participating in PvP because they don't have to as PvP can almost entirely being avoided on the back of those dumb enough to actually try and PvP inside there.