The original one is awesome. While I do like the original better than the new one. The new one did have some potential and it actually relates to the comics. I don't really see anything wrong with the new one. At least it didn't have the turtles saying corny lines such as "Help! I'm a turtle and I can't get up" or "Were you expecting, maybe, the Addams Family?"
The 1987 version was better. Even though sometimes it was a little bit corny, I still prefer it over the 2003 version. 2003 version wasn't horrible though. It was decent, but I like the original a lot better.