It sounds like last-gen consoles leaned very heavily on the LOD system, it caused more bugs than expected, and they didn't allocate enough time to fix them.
However it got worse and worse the closer I got to the finale, on total I encountered around 10-12 situations that prevented me from continuing and required game restarts and/or loading of older saves, and I had to repeat my final mission 3 times because of a game breaking bug. That is on top of all the minor bugs others have already mentioned.
While I was able to at least get between 50 and 80 fps, the performance was absolutely terrible if I consider my specs (>3500$ PC build).
All in all I was "relatively bug free" compared to the experiences of others. What I don't understand are people saying it would be "a masterpiece" without the bugs, I disagree, the game was very bland in my opinion and I regret my purchase and the time I invested regardless of the bugs and problems. It wasn't TERRIBLE, but I wish I had spent the money on another game.
That being said, I think it's a fantastic game (though somewhat shallow in terms of choice) that I am still having a great time with.
I must say that I'm a bit glad that this time consoles were taken less seriously than a PC, in majority of cases is quite opposite (with a few exceptions like GTA V and CP2077).