Beyond Good & Evil appears to be a children's game, but it is a game that can be enjoyed by both children and adults. I found the storyline to be surprisingly engaging, and was acutally emotionally moved by several scenes within the game, which I've rarely experienced in even the best games that I've played. the voice acting is also superb throughout. The graphics (especially on the PC version, but the Gamecube version is fine, too) are unique and beautiful. I'd highly recommend this game to any person who likes action/adventure games.
My eight-year old son also loved the game. This is his review: Beyond Good & Evil is my favorite game that I have ever played in my whole life. It is challenging and fun. Plus, I really cared what happened to the characters. I wish that I could find more games like it.