I perused it; now I haven't played halo 3 but I noticed that they rated player skill/value based solely on the players rank; which I think is a persistent score accumulated over time?  In which case this value would not even correspond with skill but amount of time put in ; regardless I'm not sure how that rank is indicative of player skill Possibly compounding: I don't know if halo 3 players get banned for bad behavior but if they do then of course the arseholes would have a lower rank if they had to create new profiles? I realise this is totally uninformed but having actually read the paper I am not concerned about that XD