I had a very good feeling this game was going to suck. I have only read reviews and haven't played (nor will I for what I will say next) so take this comment with a grain of salt...
... But everything about Fallout 76 seemed to not have the bits of the series I thoroughly enjoyed. I love solo questing games and Fallout with it's lore was easily one of my favourites. I also love the NPC elements of solo modes and these were absent too. Generally, I'm not a fan of multiplayer games outside of maybe GTA and Battlefield, but even in the case of GTA you have a very strong solo game so you're not locked in to having to play with or against other people.
If Fallout 76 had a good story and strong solo quest mode and the multiplayer was a bit on the side - e.g. you discover a city 1/4 of the way through your game and inside is a battle arena where can battle people for caps, weapons, or scrap with tournaments taking place at certain times etc. - that would be ok since it's totally opt in and doesn't affect your solo game at all (maybe some NPC's could offer alternate quests or dialogue options based on your battle arena rank which doesn't ruin the solo mode or something). Otherwise, this was never going to suit me.