I have multiple problems with this movie but my main issue with it is that it could actively harm children. Donatello references an anime called Attack on Titan multiple times and talks about how much he loves it. If you know anything about anime you know that it is one of the darkest and most violent animes out there. If a kid sees Donatello going on about it and looks it up that kid is going to be extremely traumutizied. It's like the writers heard that kids liked it and put it in there without any research.
A positive I will give this movie is that they did a good job on focusing on all the turtles.