After season 1, whats everyones favorite season?

After season 1 I would have to say season 7.

Season 6 would be one of my favorites. A good dose of Krang-centered plots certainly a highlight. How could anyone not be interested in 'Shreeka's Revenge'? Letting us peak a little in Krang's past while also seeing how Bebop and Rocksteady are handled under another person's authority, pretty good stuff executed well. Or 'Krangenstein Lives!', where we get to see the potential in Krang's android body explored to possibly the best we've seen from it.

In fact, I think 'Super Irma' and 'Sleuth on the Loose' are the only 2 episodes from that season I can't get into.

In all, seasons 3-8 I love about equally. It's the epitome of Saturday morning cartoons! 4 ninja-trained turtles battling a highly-trained ninja master who's teamed up with a convict warlord from another dimension, all while finding time to have a slice of pizza and watch a B-movie. Some good action, sometimes funny in a goofy way, plenty of memorable characters, great voice acting, and a shell of a lot of episodes to choose from.

I'd have to side with you on the first four to five seasons. There's still plenty of good episodes after that time period but the show was changing, and yet still not changing enough as time went on. I dunno, maybe it's just me. Perhaps I was just losing the enthusiasm I had for the show when it was new and I couldn't get enough of it, or maybe because the turtles were still fighting Shredder, Krang and the mutants in the sixth season and the show just seemed too repetitive and unoriginal.
It's a shame that all of the seasons couldn't have been mixed up more in the series original run. It could have broken up the monotony a little better.
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R.I.P. - Saturday Morning Cartoons. "You will be forever in our hearts"

Seasons 2-4 because we get to see a lot of Bebop and Rocksteady (who were my favorite characters of the show)

After season 1, the show gets very stale and repetitive to me. The animation in season 1 was great despite some errors here and there, there was a great ongoing narrative, Shredder was both funny and a genuine threat, and the whole thing had much more of an 'edge' than later on (thought obviously nowhere near as much as the comics).

Season 2 was a major step down in all areas , but it still had some of the wider narrative and 'edge'. The episodes started to become much more standalone and formulaic, and Shredder became much more of a joke than before, but it's still a good candidate for my second favourite.

Season 3 is when everything went downhill for me, the writers and animators just had to squeeze out way too much content in a relatively short amount of time, and as a result we got some very boring, formulaic plots, the jokes became much less witty, and the animation was so clunky, with so many errors it really distracted from the episodes. It doesn't help that the edge completely vanished at that point, the fight scenes became boring, and Shredder became a totally useless dumbass. There were still some gems, especially the episodes involving Casey Jones, The Ninja Sword of Nowhere, Cowabunga Shredhead, Return of the Fly, and the three part finale, but most of the season does nothing for me.

Seasons 4-6 is when things became really stale, you could tell that no one really cared anymore at this point, as plots became even more repetitive, and there weren't even that many gems like season 3 had.

Amazingly, I'd say season 7 got everything back on track, the episodes were more tightly written, I can't think of any I really hated, some of the 'edge' seemed to sneak back in, and the animation got pretty good again, I don't remember any massive errors. The Legend Of Koji might be my favourite episode in the shows entire run, which I would never have expected from such a late season.

I think the Red Sky stuff was great in that it gave the show a fresh new spin, the episodes were somewhat mixed, and I feel that shows like Gargoyles and Batman TAS did a much better job with the darker tones, but it was pretty good stuff. Lord Dregg gets a lot of hate for not being the Shredder and Krang, but it was just so refreshing to have a threatening main villain on the show, something I don't think those two could ever be again, even though season 8 seemed to be trying to make them that way. He's not as fun I suppose, though. It ended up giving us a pretty good last episode, which is something of a relief considering how mixed the show was as a whole.

Overall, I'd say Season 7 is the second best season, it's very much a return to the style and tone of season 1, and it has a very consistent batch of episodes.