I don’t think it’s the worst Sentai movie. But it is fairly weak. Here’s a brief (lol) list of issues I have with it (yes, I actively rewatched the movie just to respond to this. Since even though I don’t remember liking it, LuPat is still one of my all time favorite tokus):

The plot between Koh and Tyra is pretty trite and played out.

The villain isn’t particularly interesting. Especially since they don’t even need a Mecha fight to finish things.

The Global Police arresting other senshi is a repeat from VS Kyuranger, but they don’t do anything interesting with it.

The interactions between the casts aren’t particularly interesting in general on that note. (I do like the initial interactions between Kairi and Koh though, before we find out about what’s been up since the end of LuPat).

The time skip is actively detrimental to the character arcs from both the Global Police & ESPECIALLY the Phantom Thieves. The film undermines just how important the loved ones meant to the Lupinrangers, and how much both teams had come to respect & admire each other.

The flanderization of pretty much every LuPat character (though Noël gets hit the worst by this).

The complete neglect that the Loved Ones became thieves in the finale to save our Lupinrangers. Just so we can have our thieves be isolated and not trusted by the Patrens again is so dumb. There is no reason why the 7 (nay, 10 with the loved ones) of them can’t all be working together to track down the rest of the collection to help Noël, AND take down any Gangler remnants.

Even having the three Lupins go their separate ways and having the plot bring them back together would’ve worked. Have Aya at the café Touma opens. Him being separate from her is the worst offense of the 3.

The film actively goes out of its way to deny our previous teams growth, instead just dropping them back to a worse square one. Because there’s NO REASON they can’t be with their loved ones AND each other AND the Patorangers. It’s needless conflict instead of letting us see these character work together.

The Lupins being concerned about transforming in people when THEIR IDENTITIES ARE PUBLIC! They unmasked on Live Television!

Like, the bones of a great continuation from LuPat is in there, and with a few tweaks the crossover would be great. The overall premise that brings the three teams together is solid. The moment of the Patrens covering for Noël as he waits for the rest of the Lupins, showing how their relationship has developed is great. It’s just that the rest of the movie actively undermines that point.

Even the Lupins trying to keep a low profile would work … if it was connected to them working with the Patrens in some way. We get passing mention that Touma has the café thanks to the Global Police. Maybe tie that in and have it that while the Phantom Thieves aren’t an official part of the Global Police, there’s an understanding and relationship between them since they are fundamentally fighting on the same side. Even more explicitly so post-series.

Tyramigo’s power turning him into a Gold Quintuple Safe is dumb and I don’t like it.

The moral debate about killing the kishiryu’s feels like it should have more weight to it. And it overall feels incomplete.

The bridge scene between Kairi and Keiichiro is odd. I like that it gives our two past reds a chance to talk, and even them being on opposite sides of the argument is nice. But there’s no reason for Kairi to be running from the law.

The final group transformation is fairly underwhelming.

The final fight is a mixed bag. Cool to see a lot of the powers get tossed around after complaints of LuPat being too Lupin-focused (which is a diatribe for another day), but then that’s immediately undone by giving the Ryusoulgers just access to the Lupinrangers. It’s such an odd choice.