[PrimoPiccolo]

I think all of your assessments are fair. Lightspeed Rescue will always be one of the polarizing seasons, though mainly I've seen it has to do far more with the surface material, i.e. the look of the Ranger suits or the powers themselves being man-made rather than the actual integrity of the stories themselves, which I always found interesting. Even in the "filler" episodes, the morals being taught felt organic and not hitting the audience over the head with the lesson.