I'm not surprised. Here are my thought of what needs to happen (obviously in addition to the bugs being fixed) for people to stay engaged w/ PVP:
1. Implement some kind of fast-pass system for missions already cleared w/ 3 skulls -Yes, I've said it before and will keep saying it. It gets long and boring to go through 50 troopers a day even on double speed auto. These passes can be farmable and/or daily rewards, etc. But the amount of time PVP takes makes doing both unmanageable for many (myself included for the long term).
2. Cut down on the trophy losses for defensive defeats. You really shouldn't lose 100% of what your opponent gained because they can beat the AI version of your team. It should maybe be 50% lost for players on the same par as you (maybe a little lower if they are much higher than you and a little higher if they are much lower than you.
[If you think this is not a problem then explain to me why less than 10% of the 250 players who qualified for the Warlord III rank had enough trophies to go with their rank this past cycle?]
3. Don't spend forever balancing characters before you go live w/ worldwide PVP release but take care of the elephant in the room - Yes, the Prisoner! It really is unbelievable after all the talk that other characters were nerfed while the one who disables every passive effectively remains untouched. (Sorry for those who have him, but you know it's true.)
Nothing new here. But for me this is some of what it would take to keep me in PVP longer term. And of course new content will be needed ASAP to keep me interested in PVE.