I made a top 10 biggest flop list for 2012. You can click on the link to see. http://gamrconnect.vgchartz.com/thread.php?id=151037
However we may need to change the number 10 spot so i will let you guys vote on what you guys think is the biggest flop.
1. Twisted Metal a once big franchise
2. 007 Legends with its super low reviews
3. Assassin's Creed Liberations the Vita's big holiday game