Having received relatively few votes for my own ME3 questions, I looked at all the mass-effect-3 questions and noticed that the number of votes for both questions and answers is considerably lower on average than other top tags, for example skyrim or minecraft.
Could this be due to tactical voting because of the missions? It's in people's interest not to vote up competitors to improve their own odds of winning. I'm not saying that this is happening, I'm just aware that there's an incentive to do so.