Spoilers:
It's a pretty unique story, that they could have done so well with. I'd have gave it a solid 4. But it seemed like a good 3rd of the story was a woke message. Like we need any more of those.
It takes a good half hour before they actually settle down to the main plot. It spends the 1st half hour mostly reminding us that the parents are 2 dads. The sub plot seems to be that these guys are gay and adopted a girl. It's a sub plot that serves no purpose and has no direction or arc to it. They accused the 4 horsemen of doing this to them to pick on them for being gay, even though they killed 2 of their own people and done nothing but praise them as being amazing people and parents (even though they never met them). Same sex parents is so rare and more like a fashion statement these days, it done zero for the story and if anything, all the attention they gave it, simply took you out the story and in to a lecture.
The mix of races of the horsemen even seemed like a P.C message. When they said they would start self sacrificing, I predicted to my Mrs exactly what order it would happen. So predictable.
If they had made it a nuclear family, they could have added conflict via one of them having an affair, and the whole trip was them trying to fix things. That would have made a sub plot with meaning and it would have added to the outcome of the finale. I know personally that when you bring a kid up who isn't yours biologically, you still love them unconditionally. But there is still something more when the child is yours biologically. Again this could have added another layer if it were a nuclear family. Like maybe the child was possibly not his...
Shame... it had potential.