"Edge" is relative. You can only be edgy if you have the talent to back it up, which 2K3 was a little short on. You can't be edgy if your voice talent treats the show like kiddie fare, and the writing is hit-and-miss with no clear vision on how to work through network censors and corporate mandates. BTAS and Gargoyles were edgy, TMNT wasnt in their league. The show walked a very uncomfortable line, and even if the move to FF makes the show too "out there," at least it has no problem finding an identity now.
