You can try in Space, Time Force and RPM. Those three seasons generally have good character developments.

Whatever you do, don't jump to RPM first. All other seasons kind of pale in comparison next to it. It's probably the absolute best of all the seasons produced, thus far.

Could the movie being well received in Japan ?

in space, time force and RPM? I remember when RPM's toys were on shelves and eveything I saw was "the worst of power rangers ever!" and I was under the understanding it was what killed off the franchise until Megaforce.

The franchise died after RPM because Disney didn't give a crap about the series at that point. They stuck it in an awful time slot, and there was little to no advertising for it.

However, after having watching RPM myself, I can say that it is one of the best seasons that the show has had.

^ This. Not only was it well acted, which is nothing short of amazing, but the story was completely solid. It had realism (for what you can get out of Power Rangers), it was serious for most of the episodes, it was dark and heck, there's even a prison fight. Yes, you read that right, a prison fight.

On top of that, human KIDS are kidnapped by the villain and turned into cyborgs. (Think Star Trek: TNG Borg)

The villains had ridiculous voices and their actor suits were absolutely silly because, you know, Sentai, but forgivable in the big picture. A completely solid season.

Disney dropped the ball with their handling of this one.

I heard that the reason RPM was able to be written the way it was is because Disney was pretty much ready to take it out of their roster so they gave the staff more creative freedom with it compared to the other Disney seasons. Correct me if I am wrong.

Ladies and gentlemen, I believe I found the fight scene we were all hoping for in the movie. Someone released a cut fight scene coreograph. Here it is. And it is glorious.
https://m.youtube.com/watch?v=NnTeO6hAwWY

So.....

We got the voice of all Kivat Bats voicing Billy

The man who was Usada the yellow robot bunny, green hippo ranger in an alternate Go-Busters universe, AND the Japanese voice of Dragon Knight as Zack

The current high goddess deity of anime theme songs, Nana Mizuki, voicing Trini

Tackle from the Decade movie voicing Kimberly

The voice of Kivaala as Rita

The villain from Ninnin VS ToQ as Alpha 5

The voice of one of the monkey ninjas from the Hurricanger movie as Zordon

They must be really investing some good money hiring a good number of high-profile voice actors for Zack, Billy, Trini, and Rita.
After hearing it on the Japanese official website(http://www.power-rangers.jp/) I think they are all spot-on.

Wait, isn't that guy also Joeseph Joestar? He's pretty hard to get these days appearantly