Life long ninja turtle fan here and...
I LOVED IT!
It was refreshing to see the turtles as "teenagers" and they nailed it.
There's a great cast, some great pop culture references, and some modern lingo with classic phrases sprinkled in.
My only gripe is I didn't like what they did to master splinter and how they come to learn ninjitsu. But it's not terrible just a little.... awkward.
I definitly recommend this movie for the family