I did laugh a bit at the only ONE Power Rangers series, keeping it real! :lol I also have in my top 3 and recommend In Space and Time Force to be fair, probably that period of PR is my favourite! You also seem to know a lot more about Ultraman like I probably should!

Oh, trust me, I... *tried* to finish a lot more

Well I sometimes wonder how I sat through every episode of Overdrive, a herculean task in my book, yet couldn't finish either Megaforce or Super Megaforce!

Nothing like a list to pull me out of forum semi-retirement! Lol

RIDER
Completed: Ryuki, Den-O, Kiva, OOO, Fourze, Gaim, Drive, Ghost, Build
In Progress: Zero-One, Amazons

SENTAI
Completed: Maskman, Jetman, Dairanger, Kakuranger, Ohranger, Carranger, Megaranger, Gingaman, Magiranger, Gekiranger, Shinkenger, Goseiger, Gokaiger, Go-Busters, Kyoryuger, ToQger, Ninninger, Zyuohger, Kyuranger, Lupinranger vs Patranger, Ryusoulger
In Progress: JAKQ, Timeranger, Bioman, Kiramager

METAL HERO
Completed: Metalder
In Progress: Winspector

OTHER
Completed: Shougeki Gouraigan, Tekkouki Mikazuki

POWER RANGERS
Completed (in childhood, does that count? Lol): MMPR, Zeo, Turbo, In Space, Lost Galaxy

I have this strange mindset where I can't watch a series in one go. So I juggle several shows at once. This has actually kept me from finishing shows I really enjoyed when I get swarmed by six other shows.

Rider
Ryuki, Kiva, Decade, 000, Gaim, Drive, Ex-Aid, Build

Sentai
Megaranger, Gaoranger, Shinkenger

I have to break this up because of the line limit, starting with Sentai:

Sun Vulcan
Bioman
Changeman
Maskman
Liveman
Jetman
Zyuranger
Dairanger
Kakuranger
Ohranger
Carranger
Megaranger
Gingaman
Timeranger
Gaoranger
Hurricanger
Abaranger
Dekaranger
Magiranger
Boukenger
Gekiranger
Go-Onger
Shinkenger
Goseiger
Gokaiger
Go-Busters
Kyoryuger
ToQger
Ninninger
Lupinranger

Ultra:

Ultra Q
Ultra Q Dark Fantasy
Neo Ultra Q
Ultraman
Ultraseven
Return of Utraman
Ultraman Leo
Ultraman Tiga
Ultraman Dyna
Ultraman Nexus
Ultraman Max
Ultraman Mebius
Ultraseven X

Sorry about listing them this way, it's just much easier for me.

Metal Heroes
Juspion
Metalder
Jiban
Winspector
Solbran

Kamen Rider: EVERYTHING from 1971 to represent

Garo: Everything but the recent series

Edit: Forgot about Changerion, how could I?

I'm watching To Quger and Ryusoul right now.

Nin and Zyuoh are being shipped so I'm starting them soon.

I can also add Lupin Pat as I'm 2 in and Kyu as I'm 4 in.

I've watched all the Rider that there is to watch. All the shows at least, think the last couple movies I have yet to check out.

For Sentai I've only completed Kaku, Geki, Go-Bus and from Zyuoh onward.
The only Ultra I've watched has been Orb-R/B
And I watched RPM...probably finished some other PR when I was a kid, but nothing recent.