There's just no way to know, Joe. MrShotgun wasn't an active member of the community for long. If memory serves, he came here as part of the GameSpot reviewer union--now disbanded, I believe--and ported over a number of his reviews (or had someone do so on his behalf). The most likely scenario is that he filled out the form and neglected to update his rating from the default (5) before submitting. Then no one caught it. Or something else may have happened since, or maybe his idea of the game's value changed and the score reflects his opinion, not the number in the text. It's guesswork at this point.
"Too often we enjoy the comfort of opinion without the discomfort of thought." - John F. Kennedy on reality
"What if everything you see is more than what you see--the person next to you is a warrior and the space that appears empty is a secret door to another world? What if something appears that shouldn't? You either dismiss it, or you accept that there is much more to the world than you think. Perhaps it really is a doorway, and if you choose to go inside, you'll find many unexpected things." - Shigeru Miyamoto on secret doors to another world