It was fine. Actually funny at times, but modern teen humor which missed me, my kids thought it was hilarious. The story elements were genuinely good and the fight scenes were fun, but it suffered from the race and gender swaps for literally no reason. Homo splinter was overblown as they refer to Scumbug as she and her multiple times throughout the movie.
Ice Cube dropped too many damns and hells for my taste in a "kids" movie, but otherwise he was a great villain.
I seriously dislike the animation style, but again the kids liked it. I also seriously disliked April aside from the race and body swap. Terrible character.
The worst part of it, though, was that only Leonardo and Raphael have distinct characters. Donny and Mike might as well be one character and could have been anybody. Total failure on Rogen's part and proof that he has no fucking clue about the turtles themselves.
Oh, and the last unforgivable part was Leo falling for April the hag. No way would a teenager go for that. The only explanation for this is that every female in the movie is ugly due to the art style, but even then it is unforgivable to give Donny's relationship to Leo and make it with an ugly bitch.