IGN gives it's opinion of which gaming franchises should be killed off.
From the article : "This week's topic: Franchises that have jumped the shark. It's common in gaming to launch an IP and regularly release new iterations. Some games blossom with age (such as Grand Theft Auto), while others become stifled by a lack of ingenuity. It's not over for franchises that have jumped the shark -- there can be salvation with a re-dedication to creating new and exciting experiences. But all ten titles listed need a major overhaul, because the path they are currently on is quickly leading to obscurity."