Well I am still enjoying it. Still not done any of the story though, just wandering around doing the crime locations.(Which may have limited my exposure to all the bugs to be honest).
On base consoles it's a disaster, in next gen it's the odd crash. As for bugs, can't say I've seen anything that bad I haven't seen on other games (looking at you Bethesda), I've yet to finish a DLC for Skyrim because of a game breaking bug that prevents you from progressing, even though I was playing it on console many many years after the original launch. Fallout 76....the bugs on that were and are insane so let's not pretend it's the only game with a **** launch.
I guess we'll have to wait for the inside story on what went wrong. Maybe it's like a lot of these so called long development games, 6 years dithering about with no one in management making the required call and 2 years of mad rush, ala Anthem.