As I said before, both of those games had immense highs that countered a lot of their weaknesses. They're also both incredibly polished and high in production values. Spider-Man is an extremely competent and polished game backed by an insanely popular IP which no doubt inflated the score as well.
What is obviously special or stands out in Days Gone that could boost it's review scores? Outside of the weather system I can't think of anything at all. I think something like Spider-Man is just as average as Days Gone design and gameplay wise. The difference is Spider-Man was 10 times more polished and carried by people's love for the franchise.
Days Gone has a strong story/acting performances, and the nature and execution of the zombie horde felt completely novel to me. I was honestly surprised that it had something so impressive in it when I played it after knowing how badly it was received. It also has among the best environment graphics/design I've ever seen in any game.... It took a while for me to stop being distracted by the immense disconnect I was experiencing.
The worst problems with Days Gone, (obviously ALL of this is IMO) are a bit of jank in the combat that I feel is forgivable due to the immense scope of what they're doing -- and the stealth missions, which are abysmal, but they are also infrequent.
Meanwhile, (IMO IMO IMO IMO) RDR2's missions structure, control scheme, and gunplay are just rotten on a fundamental level. The game is brokenly bad almost to where I considered it unplayable. Here we saw the reverse effect, where I was playing a game I knew had received 10/10s and what I was experiencing as I played was an absolute nightmare. It took me a while to stop being distracted by the disconnect and just decide for myself.
I guess for these reasons I should try to just ignore reviews completely --which is something I've always tried to do, but it's difficult to not be at all impacted by external factors.
You don't see the difference between DG and RDR 2/ spiderman on a conceptual / execution level? How these games are written and acted? How these open worlds are designed?
Days Gone isn't quite as slick in its acting/cutscene type stuff, but I don't care about those things very much. In terms of gameplay, it's better than RDR2 and it's not even close. Environmental graphic fidelity is similar, maybe a bit better than RDR2. Animation quality is worse than RDR2, and this is the area where I think RDR2 shines most -- Its awesome animation system. Again, though, the gameplay of RDR2 is just worse. It's not fun to play. Playing the game and interacting with the game world honestly feels like torture.
Spiderman I can't really compare since it's apples and oranges and I haven't played it much... Plus it's not really my cup of tea. Batman button mashing combat and QTE stuff doesn't interest me.