I personally found everything after GekiRanger (Go, Sh, Gos) to be crap. Now that is not to say everything in those shows were crap, as they each had/have something that was kind of cool in them, but to be honest, Shinkenger is the only one of the three that I have watched every episode to. I just cannot stand the ranger cast at all for Goseiger, while I found the Disney-esque mecha in Go-Onger to be beyond rediculous. Not just that, but I thought the stories were dreadful as if they were trying to recreate CarRanger for a new generation and failed miserably. Shinkineger had a good ranger cast for the main five, but the villians and Kenta are some of the worst ever. In fact, I think ShinkenGold is the worst sixth ranger ever. The problem with these shows is that they are way too goofy when they are trying to be serious, the acting seems forced, the mecha is way too powerful and layered, and the fight scenes are so bland. Shinkenger had some great fight scenes, especially the ones between Juuzo and Takeru, but they tried to play the series safe. GekiRanger took risks and did something new to the series, especially when it came to the development of the villians, whereas the series after are just trying to copy what has been done before. Years ago, I called DekaRanger to be the worst Sentai series ever, but imagine my surprise when I find two of the last three series to be even worse than Deka. Deka had some potential and wasted most of it, while Go-On and Gosei have really shown me nothing intriguing at all other than how much mecha they can pile up on each other. I consider Zyu, Dai, and Kaku to be the greatest three years in a row of Sentai, which is complimented by Go-On, Shinken, and Gosei as the worst three years of Sentai in a row.