I've cancelled my pre-order for this.
I'm a huge Fallout fan but after watching some FO76 gameplay it just feels like it will get boring quite fast. All of the quests seem really basic (find something, kill these waves, kill this big bad boss enemy) and I just don't think the story is going to be good at all. No human NPC's to give quests or have dialogue with - it was all holotapes and notes with the odd robot it seemed.
VATs looks horrible and it might be fun to play with friends for a bit but there's only so much killing and looting I can take without interesting quests and story to keep me moving forward. I don't care for the building aspect either but I bet you miss out on a lot if you don't do it.
Might pick it up when it's cheaper or if it turns out it's actually awesome.