This has gone far beyond playstation fanboys who are salty that they can't play the game. This has gone into what i would consider insanity of playstation fanboys that can't stop talking about the game in a negative light, and are doing everything in their power to create and continue the narrative that Microsoft does not have any stellar games.
Is the game with its issues, yes. But, these Sony fanboys you mention have leveled up to a level of mental sickness I never thought we would get to. It's not just twitter, it's invading here and all corners of the internet.
We have them buying a game on steam just to refund it and leave a negative review.
It's disturbing.
My point is there may be a few of them, but there is no way that the score is meaningfully influenced by them. Steam has over 33,000 user reviews now. Even if 1,000 users went to this extreme length (which I SERIOUSLY doubt), it'd not shift the average from, say, 90% to the current 79.43%.
There are currently 1,488 reviews with a playtime of less than 2 hours. As you can notice in the following image, some of these reviews are actually POSITIVE (1st). While others are still playing the game (2nd), which means they do not belong to the group whose plan was to refund the game and review-bomb it. They spent their hard-earned money but just didn't like the game.
Would there be a few people who review-bombed it? Sure.
Would it have a meaningful negative impact on the average score? No. That's not mathematically possible based on the above stats.