Final Level: The Dark Isle
Why It Sucked: So you've finally solved the final puzzles and defeated Gar-Hob, the evil painter and dark lord or something. Your reward? Cut to the future, when mankind has finally touched down on Jupiter's moon, Europa—and Dave Chappelle is president. Seriously, if you're going to make the president black, at least do what even The Fifth Element had the decency to do: don't make him a stereotype.
How We Would End It: Other than that, this ending was actually kind of cool.