Sorry for the bump but found some great videos that made me think:
The original was the best, by far. It was cool for a while when they went Ninja in the original series. Zeo was ok, not the original but it was ok, Turbo was horrible IMO. In Space was an embarrassment, Lost Galexy was better then space but it was still messed up, especially when the teenage mutant ninja turtles were in it. Light speed rescue...bit better then galexy. Time force was pretty bad. Wild force was better then the previous few but was kind of messed up but was good at times. Ninja storm can just walk away...horrible the leader was a talking hamster...I never watched dino thunder. I have no idea whats next...
The best ranger was Tommy, by far.