I'm seeing a pattern here. For every big AAA release these days there is 2 threads on GAF: one for the people still anticipating and the ones who are deeply cynical of said game and can't help but pick it to pieces.
Forums need drama, people need things to discuss beyond just "I really want to play this game!"
I remember when, during the week before The Witcher 3's release, people were going crazy over the graphics downgrade. They spent dozens of pages tearing apart every fuzzy LOD texture and counting the quantity of pubic hairs on a monster's taint. There was rage, calls for the cancellation of preorders, vitriolic tweets and emails towards CDPR employees demanding apologies for their lies.
And now everyone is looking at Fallout 4 and going "Lol Bethesda you shittards why can't you make a competent looking game like Witcher?"
I'll say here what I said in those Witcher threads: Morrowind isn't perfect, Skyrim isn't perfect. Red Dead, GTAV, The Last of Us, Bioshock, all imperfect. Every one of last gen's potential GOATS could be picked apart for having some pretty major failings... but they're still all incredible games.
Fallout 4 will do many things that make it GOAT-worthy in the eyes of many avid Fallout fans. It will also do things that prevent some genre veterans from getting into it at all. That's okay. It isn't the last game in the series, so take the good with the bad and hope that, if you end up unsatisfied, Bethesda does things differently next time.