This was bad.
Tonally, it was uncomfortable. The first couple issues focused on how Bishop was such a hardass, yelling at his young students all the time. There was then a complete 180 shift in the final issue, when Bishop proved to be a softie and gave each of his students a different high letter grade, with personalized notations about each student. However, this "plot" point about Bishop's interactions with the students only came up in the first and final issues, and otherwise was ignored for the majority of this godawful miniseries.
The majority of the action took place in an alternate reality. But, the writers working on this alternate reality didn't understand about how bifurcation and cosmic resonance normally works. Rather than pinpointing one particular occasion in which this reality split from 616, there was... Something else.
In this other reality, the X-gene is only associated with melanin. Or, it only originated from a region of western Africa. Meaning that only Black people can be mutants, even if there are references to a few Caucasian mutates like Spider-man and Mr. Fantastic. And if we were supposed to treat this genetic oddity as the sole point of divergence from 616, that would be one thing. But, this reality followed some sort of convergent evolution. So, even though they're clearly different people descended from different families, somehow there are Black "versions" of all the X-Men. Somehow, there is still a telepathic mutant named Emma Frost, even though she's a Black woman with bleached locks. There are Black versions of Cyclops, Jean, Nightcrawler, everybody.
This isn't just weird, it's bad. There is no way that white people can all channel their inner Dolezal and somehow *choose* to be a different race. That's just not a thing. And if you accept the premise that in this universe, only Black people can be mutants, that has potential. But, the writer didn't invent a whole bunch of new Black characters with their own identities, powers, etc. No, he just decided that the best a group of Black mutants could be is a parody of a bunch of white mutants.
No serious discussion was made about the fact Storm was unchanged. She was Black in 616, and she was Black here. There also was no discussion about all the OTHER races, besides Black and white. Surge and Armor are basically main characters in this miniseries, and they're both Asian. The writer made no attempt to address the fact Asian characters have their own set of racism and prejudices they have to deal with. And even though we saw Black versions of a bunch of white characters, there was a curious absence of non-Black POC characters in this reality.
(Setting aside whether it's offensive to portray white characters as Black, doesn't it somehow seem more offensive to portray Sunfire, Rictor, and Jubilee as Black? Because the writer is wiping away their preexisting racial identity, that is ALREADY a minority, and substituting in a different minority status?)
We were given to understand that this reality was something of a utopia. That the world is so much happier because it is "ruled" by all-Black mutants. They have less conflict than white mutants, supposedly.
...
That is a very touchy, possibly offensive argument. It only sort of works because the writer is trying to pitch the idea of white people turning Black. It would not work AT ALL if the writer tried to pitch that the world would be a better place if only Black people could all be turned white. That would just be such blatant racism and white nationalism, no one would ever print that.
Does this alternate reality count as Blackface? If the characters truly believe that they are Black, and aren't wearing makeup, it's okay, right? Or does it still count as Blackface because the writer knows that he's changing the aesthetics of white characters to make them look Black? I should poll a group of Black people to ask their opinion, but I'm sure I would get conflicting answers. This is all just so weird and messed up, we don't have a prepared response for this scenario.
There was no logic to this world, even. Bishop inexplicably had a double in this universe, and his personality was very different. He was some sort of pacifist nerd. But, WHY WOULD HE EVEN BE THERE!? Bishop isn't native to the 616 universe. He comes from an alternate future, and was sent back in time as a police officer to try to prevent catastrophe. There is no reason why he should even exist in this alternate world. And if he did, he should still have been a police officer from that timeline's future. It's like the writer didn't even know that Bishop was a time traveler, and didn't account for that at all in the alternate reality.
Just, avoid this garbage. It might be offensive. It's definitely unpleasant.