I saw the film last week. I thought it was brilliant. I expected it just to be a remake of the classic but i'm glad they made their own version of the Wizard of Oz. It's worth seeing and the effects are great I saw it in 2D. I'd give it a 3.5 it is slow to start it took me a while to get into the movie. It's a good modern version of Oz.
Correction this is not their version or a modern version of the Wizard of OZ, and it was never meant to be a remake of it either, its a prequel to wizard of OZ