Final Level: Redemption
Why It Sucked: Take two parts Fight Club, one part American tragedy, and what do you get? A contrived attempt for Call of Duty to be more than it is: the same shooter we've been playing for a decade, now with annual releases. So Mason assassinated JFK and got brainwashed by everybody and has an imaginary friend. It's B-movie crap dressed up in a full-metal jacket.
How We Would End It: Apparently we'd be better off just leaving this one alone, since Guinness World Record voters recently decided that it's the best video game ending in history. Please kill us now.