Most people hate it because they bought a multiplayer game expecting 100% single player. I would not play it since i do not like survival games but people in general are dumbasses.
I've been playing the game 100% solo, except when some rando invites me to his team for an XP bonus. The setting is really what is getting me through the game. Everything else is meh or bad. I may be having a better time than some since I'm not expecting any role playing and am purely treating it as an adventure game. I understand the animosity, as Fallout holds a very special place in my heart.