Sure, there are a lot of reasons why 'Oz the Great and Powerful' won't be good. First of all, it's a prequel ... barf. Second, it's messing around with the mythology of one of the most loved films in history, and that doesn't always go well. (Remember 'Return to Oz'? No? Well, here's the insane trailer.) Still, this movie has got something 'Return to Oz' didn't have, friends, and that is Sam Raimi.