Before this will degenerate into a which one is better debate (and it will, it will) lemme just say this. Why should one series be the be all end all? Did they make every single Batman project like the 1966 Adam West series because it's the most popular? Did they decide to make Spiderman just a sentai hero after the Japanese series? Is every version of Superman going to look like Christopher Reeves? No. nor should they.
Even in TMNT's comic adaptions, the TMNT were open to different adaptions. The Examples
are as
Different as
day and
night.
So it's okay to
like both. Both series had their ups and downs. The old toon had great episodes, and stuff like The Mutagen Monster and the random Alien technology of season 3. The new series had great episodes as well, but had Fast Forward.
Other than the old toon, the turtles seem to have been represented the same way as the movies in most other mediums. The Live action series and the current cartoon especially. That's what makes the old series unique. The old series made light of the aspect that they were, really just giant talking turtles named after old artists, doing Ninja moves without really being Ninja-ish. And that's why that series worked that way. Krang, Bebop and Rocksteady will be missed, but not outside of that version. The movies (at least the first and current film) as well as the current cartoon takes a more Teen Titan-esque approach. They're a group of Heroes, they have a heavy burden, but they can still have fun when they have to. And that works for them as well. It was closer to the original source material, but not really as close as you'd think.
I actually dislike how people wanted the new series to be like the old one. Why? We'd get an inferior clone of that, or at least a bland retread. Superhero cartoons have to have different regenerations, as I stated Earlier. That's why Spiderman, batman, and Superman are evergreen. Looks like the Turtles could go the same way.
At this point though, I want to see omething completely different. An adult TMNT series based souly off the comic books. Manga to anime style, things are just added in to fill out a half hour.