There's tons of legitimate criticism, pretty much pertaining to bugs but damn... I remember Skyrim being just as "buggy" but I don't recall the reaction being nearly as bad.
I'm bias though as I've played on PC and had a phenomenal experience. Last gen players should 100% get a refund. Beyond that though, I just don't see it. There's some other viable critisim but when I weigh that against what the game is I just don't get it. Its objectively the most detailed city in a first person action/RPG. It objectively has the most detailed quests:quantity. I can excuse the bugs... again though, talking from a PC experience with 0 real bugs. I can see how it would be annoying with bugs but I've played GTA and Skyrim, I can survive them lol