I just saw the film and it's a piece of ****. It's not as bad as a Transformer movie, and it wasn't boring, which is good. Is it better than TMNT 2 and 3? Yes. However, the only things I like about the film are the Turtles and their chemistry and some of the action scenes. The film is 1 hour and 40 minutes, and somehow, they accomplished very little in comparison to the 1990 film. The original film was ten minutes shorter, and not only was it more faithful to the source material, it managed to give us an origin story, a more interesting villain, Casey Jones, and somehow, more time with the Turtles.
This new movie focused too much on the humans and we didn't get enough non-action scenes with the Turtles, just to see them in their home, hanging out like in the original film. One of the best parts about GOTG, is all those non-action scenes where we get to hangout with the characters and we see them interacting with each other. TMNT didn't do a good job showing the city, the sewers, the turtle's home, the turtle's relationship with Splinter or even the Turtles eating pizza.
Even though the original film is shorter, by the end of the film you feel like you know all the characters pretty well, and there are no loose ends. Splinter's voice was not good either and even worse, was his appearance. He must be the ugliest rat I've ever seen...would it kill them to make him cute? Rats are not that ugly. As Raphael would say, DAMN!! This film is not the worst film ever, but it could've been much better....I think we all knew that already.