http://vgchartz.com/forum/thread.php?id=41845
That's my attempt of an analysis on this subject.
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DMeister
You don't have to be online to vote (I believe), and as there are many guests, the total of users on here is oftenly up to 2000, therefore it isn't certain that some people inflate the poll.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS