What you need to focus on next big patch.

This is my opinion, you might disagree that's fine.

Early game class/skill ballance.
Depending on what you pick as class and skills you campaign for the first 60 lvl's can either be Amazing, or and absolut shit show.
This is why we saw so many deadeye's in the first week.

Game performance.
Abys is great yes, but i tanks your fps. So does so many other random things, like ritual and burning stuff. The constant crashes for over a week now. 1 min load times etc etc.

Trials.
These needs to be either removed or reworked completely. They are unfun and forced. One idea could be just fighting the bosses, or doing the trials with no debuffs. But keeping and endgame version with everything in them for the masochistic people out there.
I dont get when so many people complain about them, that you thought making them even worse was a good idea.

Campaign.
You nailed it with act 4, but the campaign is still to damn long. A lot of zones are just gigantic and takes more than 30 min to go through. The campaign map is confusing in act 2.

Visual Clutter.
This maybe should be under performance, but its getting out of hand. If you test the endgame you would know.

On death effects.
Someone at GGG has to be addicted to on death effects. There's so many of them its stupid at this point. And most of the time you cant see them be cause of all the crap on the screen. And why are some delayed by several seconds?? wtf.
So the amount has to be reduced.

Anyhow good patch in the right direction.