I'm with you even as a huge Fallout fan. 2 bit worry me though.
1: The reason that Fallout 3, NV and 4 still live on today is modding. Most of the bugs have been ironed out by the community and you can basically spin the games any way you want with a mod. That obviously wont be an option with FO76 so I guess we'll have to see what bugs are going to rear their head and how quickly Bethesda fix them.
2: The Grind, I hate being forced to grind in games and immediately turn off to anything where I have to constantly do the same thing over and over just in order to progress. I have a feeling that this game will be riddled with grind but hope I'm wrong.