Worse than TMNT III: Back to Japan
Stop making new TMNT movies. TMNT is over with, it was a fad in the late 80s and early 90s. It's never coming back, and you CAN'T make turtles that talk like early 1990s surfers anymore.
That kind of lingo and slang is long over with, Bill and Ted being the only vague reminder of the... how do i say it... totally radical and excellent 'cool' of the early 90s. The kind of 'cool' that only existed then, just like the way mullets had their time and place in the 80s, and that time is NEVER coming back.
I'm talking neon orange green and pink patterned clothes with triangles and x's on them. I'm talking baggy jeans you can't even buy anymore. Chains coming out of your jeans.
Some things are just a moment in time, and they won't ever come back.
The first TMNT movie came out at a perfect time in history, combining Jim Henson's creature shop , cutting edge animatronics, real NYC location shooting (which is insanely expensive now). They don't do characters like that anymore.
They just don't . It's all CG now. And you know, as good as I do, and as does everyone else, that Yoda's puppet in Empire to this day looks FAR superior to anything they did in Revenge of the Sith.
Now the movie industry is so risk-averse , they would never give a director a chance to do a live-action TMNT movie with animatronics again. If they did, they'd never shoot in NYC. And frankly, it would be an overly-lit monstrosity like most modern movies are. It's like directors have no concept of shadows anymore.