nux
The only problem i see with that formula is that if a couple of people have a problem with someone, they can go and cast a vote of 1, which would bring the average down - especially if there's a few people casting those 1's. Maybe something like an exponential average, or a weighted average of some sort. If its then a tie, you could do a bit more of a countback, until you get a result. Just a thought :)