Fo4 had a terrible reception among casuals; to the extent that it harmed the reputation of lazy critics who assumed just putting a "game is lots of fun go play it!" review on a Bethesda game would be enough for their braindead audience. Casuals were fucking livid on social media after release. I remember because I was one of very few people who enjoyed it for what it was at the time.
The reason youtubers universally gave Fo76 a "game is shit do not buy" review isn't because it's a buggy lazy Bethesda mess, it's because they're rubber-banding on how they reviewed the last time around (ironically in the exact same way they fucked up the first time, they just got lucky this time)