I think I spent like 60 (or so) hours playing DAI. After the first twenty hours the open world stuff wore thin. By the thirty hour mark I stopped visiting new areas unless required to. By fourty I stopped bothering with any completionist junk. By fifty I was entirely focused on finishing the game and it was really becoming a drag (those final story missions didn't help things, either). With the amount of legitimately good content in DAI, it would've been a better 20-30 hour game.
A while ago, I saw someone post that DAI is, like, 80/20 filler-to-critical content, and in my playthrough that'd be accurate. Exploring can be fun, the combat can be OK, the quests themselves aren't even that horrible because they're all so easily ignorable, but I absolutely cannot forgive how meaningless (or entirely absent) the dialog, choice, and roleplaying elements are in that 80% of the game; for that portion it might as well be an MMO like TOR rather than a true Bioware RPG. When vanilla Skyrim has more consequence in its open world, Bioware should know something went terribly wrong.
If Bioware manages to flesh out the filler content somehow, through free patches or even an expansion, then DAI might actually become a really good game. After all, DAI's core concept; that of a massively replayable, hugely open world, could work really well... but only if they actually remember to put in their trademark style of content as well as the more generic, repeatable stuff.