Sample size is to small. Half dozen of the usual suspects can sink the rating.
The median is almost entirely immune to this effect, which is why I listed both mean and median.
To sway the median by even one point, you would need to have
sixteen people all vote 6-or-less. That's about a 15% increase in the number of voting people, just to shift it
one point. To shift it two, you'd need a whopping
32 people voting.
This is why people use robust statistics. They're mostly immune to manipulation by a small number of outliers.
And that's even assuming I buy your argument here. We aren't seeing a review-bomb pattern here. We aren't seeing a huge stack on 1 or even 1-and-2 (which is what people who wanted to warp the result would do). Instead, it's a clear relatively smooth slope down, with only 6 being a slight hiccup, probably because of the "four-point-score" problem. (That is, if you think a product is more good than bad, 6 feels like an extremely harsh rating--effectively a D in American grading systems.)
Did anyone expect different? Hating on 5.5e/2024 is a cottage industry around here.
As someone who has never had a particularly positive opinion of 5e: I'm afraid you simply aren't correct on that.
It's taken, I'm not joking,
most of the past decade, at least ~7 years, for people to even admit that 5e has more than the tiniest superficial mistakes. It's taken even longer for people to admit, for example, that the 5.0 DMG was in any way less than an absolute masterpiece--and the turnaround was, comparatively, so sudden that the discourse here went almost instantaneously from "how could you possibly criticize this?!" to "UGH GOD YES everyone KNOWS the DMG is s#!t, can we PLEASE stop talking about it" as though it had been some universally agreed thing for years and years
when it absolutely had not been that in even the smallest degree.
By comparison, for the first three years or so, every 1-2 months we'd get another thread just utterly gushing about how amazeballs perfect 5e was and how impossible it was for anyone to have any problems with it. I have, very literally, been told to my (internet) face that
it wasn't possible for folks to have a net negative opinion of 5e.