Here's a great piece of geek art for a video game I wish actually existed, Grand Theft Auto: Gotham City.
One of the Reddit commenters suggested that if this was a game, you could work your way up from a minor thug-for-hire, teaming up with Batman's villains along the way, "narrowly escaping the Bat throughout the story... Escalating into one of Batman's biggest foes..." I love it! Rockstar Games needs to get on this.
I believe that GTA San Andreas has a Dark Knight Begins/Gotham City Mod. I'd still like to see it as an actual game though.