One word: Awesome. To tell you the truth, I had already planned to buy Brutal Legend just for the story writing and the fact that original games are few and should be promoted. But after playing the demo I have to say that the team at Double Fine has outdone themselves. This is one hell of a game, the gameplay is simple and fun while the narrative is awesome. The game has excellent polish and definitely seems worth the money.
Truthfully, I'm a bit surprised and a bit impressed. I had not suspected that the game would be this fun to play.