2. Fallout + Batman Arkham City = Fallout: Gotham City
Premise: Batman is a survivor in a post-apocalyptic Gotham City.
Gameplay: The gameplay would be Fallout, the only difference being you have more martial arts skills and better gadgets. Many of the Fallout creatures and groups would be mixed in with Batmans rogue gallery, which means lots of entertaining and challenging story lines.
Why Its A Terrible Idea: I am not even going to justify this because to be honest, this would be a kick-ass game. The only real downfall would be that you may be limited in how you can use Batman based on Fallouts gameplay, unless they incorporate some of Arkham Citys fighting style - then it would be damn near flawless.
Why Youd Love To Play: Its Batman. In a post-apocalyptic world. I dont know if you ever played Fallout, and said "this looks like a job for Batman." Well Ive never said that, but now you are Batman, and no one is safe. Not to mention adding all the creatures that made Fallout fun and throwing in all of Batmans enemies. There is countless story lines and locations that you could explore and epic quests you could go on. There is no reason this game couldnt be fun and awesome. Unless they added bat nipples, then it may have a flaw.