I'm really enjoying my playthrough. I've certainly run into a few bugs, but nothing horrendous on my end thus far (though I've heard some bad stuff for others).
My only real gripes are the mythic balancing and reactivity-Angel and Lich seem to be far above the others. I'd say Azata and Aeon could use some love compared to then. Then I've heard it all takes a backseat to their stories as well. Especially where Golden Dragon feels tacked on.
Other than that a complaint would be DLC plans. I'd rather they expanded the base game with more quests, story and locations. Maybe a post-game. They're all kind of their own self contained thing aside from DLC 1.
