Most changes are for the better, especially looting and itemization is a lot better even unique items getting random affixes I think is good, because now it's harder to get really good ones. Also lair bosses dropping not only uniques and some class specific uniques now not able to be target farmed (only belials or escalations which takes a lot of time). That at least give you some reason to grind instead of just improving on more GAs. Now overall item affixes make more sense and glyph system is ok, I wonder if it's a permanent or seasonal thing, transfiguration is another thing that added more spice to it. And I'm glad they removed masterworking being pain in the ass.
Grinding itself is not as boring as it used to because of war plans and activities trees makes you switch between activities. Maybe they could still make pits a bit more rewarding in terms of loot, especially in higher tiers and infernal hordes a bit faster because doing 10 waves is painfully long.
New skill tree is a bit better, unlocking other options to combine, but I still think there could be more variety. Also paragon is still meaningless and boring, could add more glyphs, boards and different nodes. But guess it's not gonna happen because this game tries to target coach gamers and give them illusion of choice without frustrating them. Aspects are also a bit better, I like that they are now less build specific.
The main issue still remains balancing but that's probably not gonna change, because they would have to change the whole damage calculation system that they are not going to do. Now it's still multiplier based, so every season after changes there will be some builds that can stack more dmg multipliers and do not 20% or 50% more damage than others, but 20x or 50 times which automatically makes other builds irrelevant and that's the worst part, because it removes build variety.