Eh, I didn't really like OOO. I tried rewatching it but I just couldn't get invested.
Time for a question. Out of all Rider shows you've liked, can you say something that could be improved?
Kuuga: I don't like how episodic it tended to be with the most predictable formula ever
Ryuki: Scissors was literally introduced just to get killed off, and the Movie Riders + Verde could have been cool te see in the show
Blade: I can't fucking stand Chalice's Tornado effect, that's fugly CGI
Kabuto: Tendou's a bit too perfect. He's still enjoyable, but he could use more flaws and ass beatings more often
Den-O: Boring as fuck during the last 10 or so episodes as it's focusing on story, something Den-O isn't good at imo
Decade: This exists
W:CGI for the monsters and a certain death could have been better, and the last episode was moronic
OOO: I found it a bore
Fourze: Kengou's too much of an ass to care about
Wizard: Doesn't really stand out in terms of Rider
Gaim: So much fucking filler. There's the Sentai crossover, Kikaider promotion, the football movie promotion, etc.. Such a waste of potential character development
Drive: Shift Cars are dumb and shouldn't have personalities unless they ALL do
Ghost: Shit characters and wasted potential

I feel like Drive could have been better if there was a bit more of a focus on him keeping his identity as Drive secret. Maybe an episode where he almost gets caught and has to try to come up with a way to fix it. There were plenty of non-plot two-parters in the first half of the series that could have been used to do this. It would have made the episodes where he reveals his identity have a lot more impact

Matrixbeast now officially loves you.

Also, no Kiva flaws? This pleases me. Though more of Buroon Booster, ShuDoran, Bassha Fever and the Fake Fuestles would be welcome. As would Taiga's Fangire form.

Likewise. A big story that never got resolved was Ankh's return. We know he does, eventually, but we never got the how or when (Since I think the time portal was 40 years in the future), which would be ripe for at least one final movie, but nah...
I am glad over what we got, and he wasn't brought back sloppily, but it would've been nice to have that end tied off for good.

Don't make assumptions. Everyone should hate Decade.

I didn't watch Kiva, so I can't criticize it. Can't criticize 555 because I don't remember any of it

I think it's hard to do more OOO stuff with the Greed gone. Without the Greed, there is no more yummy to be made. I did had a idea of Kousei Kougami end up accidentally creating more Greed with new medals. There is seven new Greed, Kamen Rider OOO teams up with W-Ghost to stop them.

Well, considering in Mega Max, a plot point was that Kougami successfully created a new set of medals and his own driver, it's not impossible to create a story line about failed medals and the possible Greeed that spawned from them.

Watch Kiva. Kiva is good.

Maybe after Kabuto, BatmanTAS, Animaniacs and Futurama

V3: Keep Baron Fang around for a lot longer and don't bother with Archbishop Wing.

X: Some proper goddamn fansubs.

Black RX: Closure on Kasumi and Kyoko.

Agito: Don't kill Risa. She was awesome.

Ryuki: Femme as a main character on the show.

Faiz: Dial down the melodrama a few notches and end the show with some amount of closure.

Hibiki: Do I really need to say it?

Den-O: Lock Yuriko Shiratori in her trailer between scenes until the last episode is filmed so she can't leave the show. Do anything better than Kai for the villain.

Kiva: Burn everything in a dumpster and start over.

Decade: Keep the original writer or, at the very least, make the replacements work off of his notes.

Fourze: Improve the pacing on the Horosopes so half of them aren't just MotWs. Also get Yuuki some fucking Ritalin.

Wizard: Improve the overall pacing, lock Makoto Okunaka in her trailer too, fire Shunpei into the sun, and bring Mayu in earlier and give her a proper costume.

Gaim: Stop wasting episodes on pimping other Toei projects.

Drive: Make the first half more like the second half. More Belt-san spit-takes.

Ghost: See Kiva.