Zyuranger, Dairanger and especially Kakuranger were what I would call "experimental" shows.
Before them, despite having diffrent power sources, most of the Sentai shows were mostly military or sci-fi themed and quite simple. Some were more dramatic than others (Jetman, Liveman etc.) but they had a pretty straightforward good vs bad thing going on.
With Zyuranger, things started to change, and it always seemed like the writers were trying to make social commentaries for children.
Zyuranger was mostly about children having personal problems with themselves or with their families, and the villains of the show were mostly targeting kids basically because they hated them.
So pretty much every episode was like this: "Kid of the week has a problem. Kid of the week gets involved with the villains latest scheme. Zyuranger comes to the rescue"
There was the Burai/Dragon Ranger arc, which added a little more to the show, but you have to sit through a lot of filler to get to that point.
The weirdness in Zyuranger often came with the villains schemes. Some of them were interesting, but others were extremely weird.
Examples of the villains plans in Zyuranger were:
Imprisoning children in trees that are to be cut down to make way for a golf course.
Cupid-baseballs that makes people fall in love with the first thing they see.
Vampire-ish flowers.
You get the idea :laugh:
Dairanger is a bit easier to swallow, but you have to be a bit stubborn and get yourself through the first few episodes.
Again, you have the weirdness of Zyuranger with a lot of below-the-belt humor added, and it is one of the shows were the writers said "action first, story later", which means that in the first episode you are presented with a bunch of random people you have no idea who are, and suddenly these people know how to transform into super heroes and fight. (After being chased by grunts on bicycles)
This can seem very strange to a person who has been used to Rider shows, were the main characters get a lot of focus in the first episodes.
But Dairanger IS a good show. No doubt about it.
Its just hard to get into if you are not used to the style.
Kakuranger took the full step into insanity by adding so much humor that it sometimes felt like a parody. You suddenly had cartoon or comic book effects during the fights and a narrator who would often break the fourth wall.
This got toned down a bit in the second half of the show, but again we are talking about the first impressions that these shows will give you.