Okay, so here's the thing -- I watched this film over a week ago, and I'm still thinking about it. Why? Because I get riled up over films that are SO CLOSE to being good, but just... aren't.
The Late Bloomer definitely falls into this category. There are bits of dialogue and interactions between characters which are genuinely top-notch comedy, and the supporting cast put in one of the best ensemble performances I've seen in ages. Seriously. Kumail Nanjiani in particular is fantastic, and J.K. Simmons continues to be the best supporting actor in Hollywood right now.
Buuuuuut... there are six writing credits listed, and it's likely that therein lies the problem. The moments of brilliance are almost completely overshadowed by other bits of writing which are, at best, trite, and at worst completely cringe-worthy. The last twenty minutes or so of the film legitimately don't even make sense, and are among the worst I've seen all year. It really feels like something that was cobbled together from different people who had different ideas of what the film should be, and maybe some of those people were... incorrect.
So yeah, I wish this film was as good as it could have been. A lot of inspired performances and great dialogue that deserved better than what this ends up being.