The Uncharted 3 8/10 was amazing for a few reasons.
1. It hammered home just how ridiculous the console wars are.
2. It really showed you who the people to ignore were.
3. It showed how stupid having review scores for highly subjective things like video games are.
4. It brought a lot of attention to the overwhelming bias that the old forum had, and made it pretty much impossible for anyone to deny.
I don't participate in review or guess the MC or "hype check" threads because all they are are opinion validation threads. People have already decided what score a game should be
before they've even played it and anything below that is biased, wrong, has an agenda, and is a fanboy looking for attention. Give it above that score and you're a bastion of knowledge, an unbiased Saint, a respectable publication that should be trusted. At least until the next review.
Any big first party release for the forum favourite console gets this same treatment. Games like Knack, the order, no man's sky, etc all have been built up to be GOTY titles before anyone has even played them, even when most of the showings look subpar at best and plain bad at worst.
Honestly I was hoping a big publication would dare give Spiderman a 6-7/10, just so I could watch the inevitable meltdowns. They would've been amazing. I saw people getting upset over it being a MC of 87 instead of an 88 for Christ's sake, like that matters.
A more recent one was that Forza Horizon 3 review that basically called Playground lazy and obviously bored with making car games
I don't think that really fits this thread though. Giving a game that was almost universally praised as one of the best games in the genre in forever, as well as one of the best games of the generation, which is still praised to this day, a 4/10 and giving some obviously BS reasons for it like you said, isn't the same as someone getting irrationally upset at a game they haven't played "only" getting a 8.8/10.
You look at the list of reviews for FH3 and read a few and there's one that sticks out like a sore thumb. That was clearly someone that didn't want to give the game a good score from the get-go. An 8.8 is a damn good score, that's why the reactions were so amazing to watch. A 4/10 in this day and age says the game is virtually "unplayable trash", and there's no subjective way anyone can call FH3 a 4/10.