I posted this in a different thread, but is relevant here...
I'd like to see them implement a "favorites list" system.
Each person gets to list 20 games as being "a favorite".
Then you can rank the games by how many times they appear on someone's list.
The advantage to this is that one person can't screw with the rankings very much. The best/worst they can do is include or exclude a title on their list.
If you love MM, great...put it on your list. If you don't like it...leave it off. There won't be any of this "give it a 10 to try to move it up" or "give it a 1 to try to screw it over".
It also might reduce the "it's a new game so it must be great" factor. It will be harder to automatically include [newest release] on your favorites list if it means you have to remove one of your existing favorites from your list.