Easy one here.
http://www.vgchartz.com/games/game.php?id=24255
Ben 10: Alien Force opened to about 6,000 units. This Black Friday week it sold over 45,000 units.
Also its predecessor:
http://www.vgchartz.com/games/game.php?id=12584
Opened to 12,000 units worldwide and now is currently over 850,000 units. Quite a success story for that one.
I think the thing to learn from these trends is Wii games are "trendy" and I don't mean that to be a pun. It's just they get big not at release for the most part but when mainstream notices them. And when they notice them is not really dependent on anything aside from holidays. And sometimes its not even about them noticing it but simply buying off brand during the holidays. It'll get popular and everyone will want it because the increased sales means the dev can do some more viral marketing.
