Thanks for the welcome J3, Im glad to be on-board and helping alexp moderate the site and keep things running smoothly.
As for this bug, I talked to alex about it, and it turns out that what Rommel described does happen: you can rate a story mutliple times, but only the most recent rating is counted. However, the number of ratings will increase the counter, but it won't factor in each and every rating into the overall rating calculation.
Also, when you try to rate any page, you will see that ratings are affected by a standard deviation, so, for example, if a game's current overall rating is around a 6, and someone comes along and tosses it a '1' rating, that rating will most likely be thrown out, since it is outside of the standard deviation.
Quoting Blizzard Entertainment, this is "working as intended."