Worst Season of the FW TMNT Cartoon?

[TurtleGuy]

Season 1: Contains 5 episodes with an ongoing arc. Usually regarded as the best season by most fans

Season 2: Contains 13 episodes. Things start taking a focus more on comedy, but still has an air of seriousness(at least in comparison to the seasons that follow.) Notable for the Eye of Sarnath arc and Baxter becoming a fly.

Season 3: Totaling at a whopping 47 episodes, season 3 is the longest season by far. Also has wildly inconsistent animation between episodes and other such problems such as using first drafts of scripts. Things start really getting silly as the show focuses more on comedy than action. Introduces characters such as Leatherhead, the Rat King, and Miyamoto Usagi(who is mistakenly called Usagi Yojimbo in this series).

Season 4: Contains 39 episodes. Michelangelo loses his nunchucks and gains a grappling hook due to nunchucks being banned in UK television at the time. Infamous for it's abundance for generic mad scientists and mobsters. It also introduces fan-favorite characters such as Mona Lisa and Slash.

Season 5: Contains 20 episodes. Introduces characters like Mondo Gecko, Muckman, Hokum Hare, Wingnut and Screwloose.

Season 6: Contains 16 episodes. Don't really know what else to say...

Season 7 Vacation in European: Contains 13 episodes. These episodes are supposed to take place in season 4, but for some reason was aired later.

Season 7: Contains 14 episodes. This is pretty much the last season of the show to use the classic formula. Also the violence gets ramped up and we get better fight scenes as a result.

Season 8: Contains 8 episodes. Things get darker in the season as there is now a permanently red sky, less of a focus on humor, and things get more serious. This is the last season to feature the Channel 6 crew and Shredder, Krang, Bebop & Rocksteady as regulars(though Shredder Shredder and Krang would return for a bit in the final season.).

Season 9: Contains 8 episodes. Things get even more of a change as Lord Dregg replaces the Shredder as the main villain, the Turtles get a new ally named Carter, and the Turtles themselves start mutating into super mutants.

Season 10: Contains 8 episodes. The turtles are still fighting Dregg, but the super mutations stop after the first 2 episodes. Notable for bringing back Shredder and Krang for 2 episodes. This was the final season of the series.

So which of these seasons do you consider the worst?