I've seen it at the Imax, i thought that meant some of it was in 3D but it didn't mean that at all so I was disappointed it wasn't 3D because it could have been.
I am a huge fan of the original batman POW ZAP holy spaghetti batman.. It doesn't matter that you haven't seen the others as they are nothing to do with each other.. It was very good, I enjoyed it and I'm sure you will too. Batman wispered a lot with a lisp and it reminded me of Jim Careys character in Me Myself and Irene.. Recommended.