I found the main questline generally enjoyable. Nothing groundbreaking, but enjoyable from a cinematic perspective, and characters who were interesting enough that I could at least tell them apart by the end.
The rest of the game felt bad. At one point I was only level 40 and the next part of the main quest was level 45, so I sort of had to actually play the other parts of the game, and it felt like work. I did dozens of bland fetch-quests, and explored dozens of barely-distinguishable regions. I leveled up my skills and items, but doing so changed almost nothing about playing the game, because the enemies leveled up at the same speed as me, and my skills and items barely changed what they did for the entire playthrough.
I strongly disliked the decision to have enemies level alongside you everywhere you go. It killed much of my sense of progression as I played the game (I'd go to Act 1 to level and do sidequests when I had been in Act 4 already), and made all the enemies feel essentially identical (they all did the same damage, they all took the same amount of time to kill).
I was left with the fear that there might be some sort of enjoyable game behind another few dozen hours of grinding to get to lategame dungeon farming, but the resignation that I had no desire to do that grinding, especially given how little reason I had to trust that the game would become fun when the only thing that had been fun about it so far was watching cutscenes and getting nostalgia jolts fighting callback enemies, and I'd finished the main quest so I figured that wouldn't happen anymore.