Gekiranger is my fav, but I love all of them from Magiranger-ToQger and Abaranger.

The Gekiranger, Shinkenger, Jetman, and Kakuranger themes are incredibly catchy.

This guy knows what's up.

I recently listed to a playlist of every Sentai OP theme. These are the ones that I loved:

Goranger
JAKQ
Bioman
Maskman
Jetman
Dairanger
Kakuranger
Megaranger
GoGo V
Gingaman
Timeranger (arguably my favorite of them all)
Gaoranger
Dekaranger

I don't think there's been a very good theme since Dekaranger. Shinkenger's comes the closest -- and ToQger's is pretty good, but I need to hear it about 50 more times before I can tell if it holds up. :lol

Looking over my list, it's clear I have an affection for 90s era Sentai themes. :lol

Finally, some love for Dekaranger :lol

Every time I hear that OP, it's in my head for a week!

When I think of catchy Sentai OP/Ending themes I think of the themes to:

Bioman
Jetman
KakuRanger
MegaRanger
Gingaman
GoGo Five
Boukenger
Gokaiger
Kyoryuger
ToQger

my favorite themes are gokaiger shinkenger kyoryuger and kakuranger

Dekaranger's theme is definitely awesome. Gotta give ups to Go-Buster's 1st theme too. Never understood why they changed it midseason.

Also listening to Gorenger's theme right now...SOOOOO catchy!!!

Turboranger
Megaranger
Abaranger
Magiranger
Go-onger
Shinkenger
ToQger