It was Interesting
Not usually a fan of cross-overs, but since it was Batman, I thought to give it a shot.
There was quite a bit to enjoy.
SPOILERS
However, I did not like the face design of the turtles. They looked dead in the eyes, and the faces had no emotion. Also, turning the Batman villains into mutants was a mistake, in my view. The 2x fights between Batman and Shredder were great.
That said, it was a one-time watch for me.