It is hard to say. Right now, Go-Onger is by far the worst, but Goseiger could possibly even top that.
Here is my order excluding Goseiger though of the top 3 worst Sentai series:
1. Go-Onger
2. Dynaman
3. DekaRanger
I agree about Shinkenger and I'm disappointed that it's probably going to get a whole horde of new fans thanks to Power Rangers. It doesn't need to be any more popular than it already is. It is eating into the franchise - people refuse to watch or support other series because they insist Shinkenger is THE BEST and nothing could ever top it. To add to Jedibmoney's review: it had a main villain who spent much of the series sitting about doing nothing, Mako was awful to Ryuunosuke and Kotoha and had no business to interfere in Takeru's affairs yet we were expected to view this positively just because she was pretty (I am not "Mako-bashing" - there are other characters like this in Sentai), there was basically no plot for a dozen episodes and Genta was a classic case of Sixth Ranger Syndrome.
I don't get the love for it either. It was terrible. The villians did nothing. They had no development at all until the end (and even that was barely anything beyond Juuzo and Daiyou). the mechs were rediculous and just kept piling up, and Kenta is the worst 6th ranger ever.
While I like Gekiranger and think it is a good series,the characterisation was terrible. The plot was built almost entirely around the Red (this was a problem for Shinkenger too) and the development of Ran and Retsu was abandoned in order to focus on Rio and Mele, who remained steadfastly unlikeable. GekiViolet and GekiChopper had no purpose beyond merchandising, since it was made apparent early on that they weren't that important to the final conflict - only Jan could defeat Rio, only the main three could defeat Long.
Now this I disagree on. Sure, you are probably right about GekiChopper, but Rio and Mele are far from unlikeable. In fact, they have become the best Sentai villians to be threatening since GoGoV's Saima Clan. And as much as I love Rijewel and Jannu from AbaRanger, as a whole, the Evorians were pretty lackluster villians for the most part. Voffa and Mikael were just bad designs. Rio and Mele were tough, they would fight the rangers instead of just sitting in the background drinking sake and whine about their defeats. Not to mention their upgraded forms were fantastic. Oh, and the fact that they had human actors playing them made their emotions feel more powerful. As for the rangers, they were all well done. Yeah, it was pretty focused on Jan, but most of the best Sentai series truly focus on the red ranger. Look at KakuRanger, DaiRanger, and CarRanger. They are by far three of the top five best series and the red rangers in those were focused on heavily.
Oh sweet, another Go-onger bashing thread.
I haven't seen on of these before. :shakefist
It isn't our fault Go-Onger is by far consider the worst Sentai series of all time by anyone. Can you honestly tell me that there is a series (besides Goseiger) that even has the potential to being as shitty as it?