Like I said, that's a misrepresentation.
There's a huge between divisive, and ones where pretty much everyone agrees its mid, it's just some people are going with "mid but ok" and others are going "mid but bad".
This isn't 2/10 vs 9/10. This is 4/10 vs 5.5/10.
And the majority of critics are coming down on the 4/10 or lower side.
And no, absolutely not re: niche, that's just reality denial. Niche is a separate thing. Niche films don't crash and burn in critic reviews, generally speaking. Niche films in fact tend to do very well in critic reviews. A lot of films that almost no-one goes to see, and that are really only for a relatively small number of people - i.e. niche have 80-100% RT and 75%+ Metacritic.
This is exactly the problem. People are pretending a movie that almost all critics agree is a mediocre is "divisive" and it's not. It's mediocre. It's just for some people it was mediocre in an okay way, and others in a "this is crap" way. No-one is going to come out of this thinking it was an incredible movie, not even in the way some people might think that about Michael Bay's Pain and Gain.