[Dr Kain]

Gaoranger. I got the Hong Kong bootleg DVDs from a store called Animeniacs and was a fan from that point forward. The next series I saw included Hurricanger, Dairanger, Zyu, and what was currently available from Abaranger (as it was airing at that time).

[Sentai King]

Shinkenger then Gokaiger then Kyoryuger

[Doug]

First Super Sentai series I watched was ToQger. I'd read plenty about Sentai and the differences and all that but hadn't ever had much interest in watching them until it was decided that Go-Busters wouldn't be adapted.

At that point I decided I'd watch stuff that hadn't or wouldn't be adapted. I caught wind of the likelihood that ToQger wouldn't be adapted while it was still airing, and I actually thought it looked cool, so I checked it out and got hooked on that.

I actually really enjoyed ToQger. Since then, the only other Super Sentai series I've watched is Go-Busters, which took me a long time to get into, and I never really got too into it.

Figured that'd be all I watch, but a couple folks highly recommended Magiranger, because I really like PRMF, so I actually just started that (a couple episodes in).

[Matrixbeast]

I think a lot of Sentai are worth watching.
This isn't a "SENTAI IS BETTER!" situation, but rather, a lot of PR series tend to stick somewhat close to the source material (Some are vastly different, like In Space and RPM, but generally speaking...), so if you enjoyed a PR like Jungle Fury, Dino Thunder, or SPD, you should check out their Sentai counterparts.

[ULSK12]

BOUUUUUUKENJA!

As a young child I enjoyed the series for its comedy and giant robots like sentai is supposed to be enjoyed

That was enough for me to watch both Tomica Heroes, Go-Onger, Goseiger, Gokaiger, a bit of Go-Busters, Kyoryuger, ToQger, and Ninninger, and enjoy all of them, so it was a success.

[catwhowalks]

Techincally, I'm pretty sure it was Bioman. My parents are missionaries to the Philippines, and as a 4-5 year old I was hooked on this Sentai show. So much so that when I did something really bad (can't remember what) the harshest punishment my dad could give me was to ban me from watching it for a couple of weeks and it is still the punishment I remember the most to this day.

Years later as an adult I really wanted to find out what series it was and started researching Sentai. What I could remember of it and what shows had been released in the Philippines seem to best match Bioman. Around this time I foundn Linkara's History of the Power Rangers. Having seen a bit of that as a teenager, I become curious in both and decided to try again to find the original source series. This in turn led me to find the subs by TV-Nihon, and when those ran out, I discovered GUIS. I pretty dropped everything else I was watching for about a year and a half, with occassional breaks, and caught of on everything that was fully subbed.

Thing kinda came full circle when I ended up watching the Available Bioman episodes, found out GUIS needed help with them and ended up pre-timing the rest of the series. The next episodes they release will, I believe, be ones I have worked on. I am rather proud of that.

[Boshusan]

It was Bioman, when I was 8 in 1985. Before the PR era, tokusatsu shows have been a thing for a few years in France.
It wasn't the very first toku show I saw by the way, it was Uchū kara no Messēji (Message from space) , but the one I was really crazy about was Uchū Keiji Gavan when I was 4~5 years old.

Then the show that le me rediscover super sentai was Kogaiger. At the time I didn't know Toei has continuously been making a super sentai serie each year.

[Shinken Red]

During RPM I discovered shinkenger and loved it. However the first show I watched to its end was Go-Busters.

After all this time, Go-Busters is till my favorite sentai. Such great CGI, amzing stunts, great dark stories and wonderfull complex villans.
Super fun ride if a bit shaky in the middle.

[Kiryu]

Started with DekaRanger.

The badassary that is Dekamaster is what drew me into watching it.