Being concerned with people who vote too low is important but let's not forget the ones who vote way too high. It's a less important matter, I know, but there are many cases in which an author submits something he or she knows is crap but a bunch of his/her "friends" (or multiple accounts of the same person) vote 5 anyway and save it. The best examples are StrawberryClock's movies like B, and remember that these movies' reviews have a bunch of "other" clocks saying retarded stuff with no depth, voting 10 in every category.
By the way... when I saw the movie Aura, I didn't like it and voted it 2, and in my review I gave it overall 3. It's in the top 50... was that too low for what the movie is? Let me know and if I must I'll be more careful.