Funny, pretty sure the Witcher 3 is renowned for having far more game breaking bugs than even Skyrim, still, despite being out for months. It definitely has more than Fallout. Fallout 4 is probably one of the most polished RPG's of its scope, ever, at least in my experience of the more innovative RPG's in the last eight years or so. 

Everyone is entitled to their opinion, the wasteland particularly isn't for everyone as it reflects a dead world rather than something surreal and magical, but based solely on technical merit, Fallout 4 is exceptionally well done.

Anecdotal, but in 80 hours, two playthroughs, not a single game breaking glitch (particularly because of the innovative and immensely useful auto save and quick save features.)