I have the same problem with Act 3.
When exploring Act 1 and the Shadowlands in Act 2, I wanted to find all there was. There were small quests hiding in far reaching corners but nothing felt overwhelming or like it didn't add to the story itself.
So much of the quests in Act 3 feel like chores and most of them have little to no impact on the story (except the companion quests). The undercity in particular is super frustrating to go through.
In addition, everything is so saturated. There is way too many nothing-burger quests that provide almost nothing as a reward. Considering you had reached max level at the very beginning, there's no incentive to get experience. You've been a bajillionaire for a long time so you don't need the gold. And unless it's going to elicit an interesting companion reaction or decision you have to make, everything feels pointless.
What they need to do is increase the level cap, get rid of innocuous fetch quests, increase the amount of decision making, and HEAVILY improve companion reactions and interactions particularly at camp.
