Played Assassin's creed Valhalla. It is very buggy. Some quest can't even be completed. Items are duplicated (in a bad way). You can start a quest where the story assumes you already completed other parts of the game and if you don't reload an earlier save you are stuck. However even with all those problems overall it was still a pretty good game. The story isn't great and the fishing mini-game REALLY sucks. I say that as someone who LOVES fishing in games. It is just an unnecessary pain in this game. All that said the story was passable and the combat was enjoyable and the level scaling is EXACTLY how level scaling should be. The bugs do need to get fixed eventually. NG+ needs to be implemented in a good way, and there is a lot of places that can be expanded on VIA expansion packs, but I don't regret playing the game. I know some people are returning it, but I think it was close enough to being worth the price even though it fell short and pushed too many modern "inclusive" things. As in there are WAY too many bi-sexuals in game and it's considered "normal" in spite of the historical setting. It also shows an incredibly skewed version of Christianity. Lol..sorry I got on a bit of a rant, but yeah a degree of buginess is forgivable.
So I don't know where you've seen so many bugs, I think you're playing on console? Because I who play on PC, I must have encountered one or two bugs no more and to tell you there are so many things to do in this game, that currently I am at 111 hours, and I have not finished the game yet, so maybe the versions distributed on console have problems, for my part I took it in dematerialized directly on uplay, and I have no problems, I even come to call the character main: Eivor of riv. So no I'm not necessarily a Ubisoft fan, but their last two games, Watch Dog and Valhalla, are really well done at all levels. Both graphics, activity, quests, history. They are top notch, and make me wait cyberpunk with astonishment, I did not expect either of these two games. But it's a classic in the world of games, we don't expect it, and we have good surprises, and sometimes very bad ones for the expected games.