In the final season, the cops of the Nine-Nine end up going through changes in their lives.
It's B99, so the show brings the same sense of humor it's known for and does a decent job of wrapping things up and bringing back recurring characters for final bows. (No Vulture surprisingly. And, would it hurt to show Terry's wife or Boyle's longtime girlfriend one more time after years of being forgotten?) However, like the last couple of seasons, the show is no longer it's prime. It's still B99, but it sometimes feels like it's going through the motions and the jokes don't have the punch they used too. Also, there's an episode about Boyle's close-knit, weird extended family, a joke that I think has been ground to a fine dust by this point and definitely didn't need a whole A plot for.
One admirable change of this season is that it has a few episodes addressing the lack of accountability for police. Sure, the cast has grappled with cynical, corrupt, or selfish other members of the force before, but it was in a TV show-ish non-political way. With the exception of one episode about racial profiling, the show has shied away from real world controversies with police abuse of power. I give them credit, albeit belated and their hand may have been forced due to the current climate, for actually addressing hard issues.
This season has a new antagonist, police union president Frank O'Sullivan (played by Scrubs' William McGinley). On the one hand, the character feels too similar to other rivals within the force that the characters have had. Plus, he's a momma's boy, and all the jokes about that are as old and predictable as you'd guess. On the other hand, he does have some fun lines and McGinley is a comic delivery pro.
Though this season was mostly just alright, they nail the annual heist (which always risks running out of steam but never does) and the final episode is done really well. This finale tries for tugging at the emotional heartstrings like its creator Michael Schur's earlier show Parks and Recreations did. This doesn't quite hit that mark but doesn't miss by much.
Also if you're a fan of Hitchcock (Dirk Blocker), I must be the bearer of bad news: probably due to COVID, his screen time is teeny tiny.
If you're a fan, you probably will want to see this. It's not one of the best seasons, but it ends the show well enough.