Good:
Environment looks nice
Exploration is fun
Combat is fun
Puzzles are well spaced out and not overly long/complex
Occasional good side quests
Voice acting is quite good
The Room of Requirement is a nice change of pace, especially the vivarium

Bad:
Story makes no sense
Most side quests are lame
World has no reactivity (casting unforgivable curses causes absolutely zero reaction, for example)
Performance is shamefully bad on PC

Pros outweigh the cons for sure but it could be so much better.