I suppose its the curse of many successor to great games..
I think the main complaint is that due to the successful marketing campaign, Fallout 4 did sold widely more despite being an overall worse game than New Vegas, when not looking at the graphics
I honestly don't consider any Fallout a great game. Some of them are really good (FO4) but no, not great. And the older ones have not aged well at all. I tried replaying FO2 a few years ago and the archaiceverything had me quit because it was too frustrating.
Blizzard Battletag: UnderDog#21677
Shepard: "Wrex! Do we have mawsign?"
Wrex: "Shepard, we have mawsign the likes of which even Reapers have never seen!"