Let's pretend the internet doesn't exist, and that you'd have no way of knowing whether or not a game will be good without playing it yourself. In this scenario, the only way you might form a preconceived opinion about a game is by looking at its box art. As any scientist would tell you, first impressions are pretty important.
Good box art is both tasteful and indicative of at least a part of the experience at hand. Bad box art often takes form in horrible illustrations, shirtless muscle-bound barbarians, a comical misrepresentation of the game it woefully attempts to depict, or a combination of all three. Yes, tastes in art are subjective, but the following games have objectively hideous box art--a shame considering all of them are rather great.