Duke Nukem Forever
Ah, the prodigal son of '90s first-person shooter fans. Gone for more than a decade, Duke Nukem returned in the long-awaited Duke Nukem Forever. It was in development longer than some of you were alive, and many would probably argue that it should have stayed there.
Forever's biggest problem may have been, well, its biggest problem: that it took so long to develop. It was worked on by so many different people and through so many generations of gaming that the final result came out like a casserole made of all the worst elements of FPS games from the last decade and a half.
And although Duke was always known for being a badass who doesn't give a fuck what you think about him or his strippers, it just wasn't as funny in 2012 as it was in 1995. We'll be surprised if he gets another chance at a comeback.