Charlie Murder is a side-scroller action for four players with light RPG elements. It's bloody and fun co-op makes it even better. Comparisons with Dragon's Crown can be relevant but they are very different games, especially when it comes to game art.
The goal is simple, defeat whatever comes on the way to punch and kick. You can go alone or with the help of up to three other players locally or over Xbox Live. It's fun enough, even if you play alone, but this is definitely the kind of game that is best with some friends. There is also one of those games that uses the co-op as an excuse. Charlie Murder has really quality both solo and with friends.