I'd give it 6/10.
Enjoyable enough, lacking any real depth or bite to it though. The actors aren't great either. The witches are one-dimensional, lacking much subtlety, and the Wizard himself isn't particularly likeable. I did think that it was better than Alice but that is damning it with false praise. For the first hour or so, it is terrible. But once the second hour kicks in it gets better, thought not a great movie by any means.