It honestly feels a bit wild to say that a 50 episode show could've done with having one more episode, but honestly, BoonBoomger feels like that would have made it spectacular. The run-up to the final episode was so great at ratcheting up the stakes past any reasonable point you'd expect a Sentai to go to, and while I'd say they did a decent enough job of paying that off, I do have Some Notes.
My main problem is honestly that the show quietly shuffles past any and all details of the whole Taiya Ishiro Double Agent Gambit. Like I know we're on the clock here but SURELY a little montage or flashback or something would've made it hit much harder? I mean if it was intuitive what the plan was and who's responsible for what, it'd feel a bit better, but as it is I feel a little bit let down. Granted, I am the exact kind of bitch that would LOVE a full episode dedicated to What Happened There, so I might be biased.
Also, I would have loved if that whole "Anti-Ghyasoline" thing got a little bit longer to marinate. It's clear that there is some Monsters Inc thing going on, but the whole thing feels like it needed to either be elaborated upon (I mean if something needs to power the Rangers it could easily be that,) or made vaguer. Let it be a "clap if you want Tinkerbell to live" type thing, sure, why not. Show's earned it.
That said, there are some decisions I really liked. Like how closing the show with an (interrupted) forced wedding in the same way that it opened in ep 01 is solid stuff, and my only complaint is that Mira should be allowed to kick a little more ass in that bridal dress. It's enrichment, you understand. Also, I think Jou deciding to stop being a cop was a very good move for him, and Sakito got some real strong moments that really endeared me to the guy.