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1) Add another digit, or two, to the rating. Games move so slowly that it's hard to see if one is improving or falling, or how close games are to each other.
2) Weight a person's score by its age. MMOGs sometimes get better... or sometimes worse over time. A vote 6 months ago may no longer be as relevant.
3) Add a trend chart for a game's score. That way you can see if it is getting better or worse over time.
4) Allow a person to show rankings by just one of the stats. Want to play the game with the best graphics? Or Roleplaying? Sort by those scores only.
5) Allow a preference so a user can save which order they want to view the games list--by name or score (or if the above is implemented, by their ranking method).