Being from G4 doesn't make it hold any less weight, shut the hell up. I specifically requested that everyone refrain from bashing this just because it's from G4.
A movie that isn't inspiring can be good, it just depends on the context. Same with a painting that's "serious" or isn't visually interesting. This means that they are "Enjoyable" not "Fun", those are two completely different things within the context they are usually used in. "Fun" is subjective from person to person, I agree, but in a broader term everyone expects that every game must be "fun" to be a game at all. Documentary movies, books, and serious paintings aren't "fun" so much as they are "entertaining" or "enjoyable" but those are completely different from being "fun" for people.
You can still watch a documentary and have it be "enjoyable" but rarely is a documentary on obesity or World War II actually "fun". With games, everyone expects them to be "fun" as in making the person play them happy, and to a degree they are right. But games, like "Six Days in Fallujah", aren't so much as to be "fun" as they are meant to be informative and showing the player the horrors of war and such.