I’m not a TMNT fan and never was. I’ve never seen or read any of their cartoons or comics. Therefore, I can’t say how a lifelong fan will feel about the movie and weather it lived up to any expectations. But if you’re like me, take a pass. There’s nothing here for newbies to enjoy.
However, if you have kids I could very well imagine that they’ll enjoy it, maybe even love it. I know the other kids in the theater sitting around me all seemed engaged throughout the movie and excited as they left the theater. And that’s probably why it fails to appeal to a more mature audience. The story was told for kids. It felt like a live action Saturday morning cartoon. At least the ones that I remember.
If you have kids my advice would be to take them to see Guardians Of The Galaxy a second time and just skip over TMNT. At least that way you won’t have another franchise worth of toys to buy for your kids.