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I'm actually going to have to go with "it's a Nintendo game".

Look at the best selling games on Wii;

Wii Sports and play can't really be compared

Wii Fit and Mario Kart Wii have far better legs. Wii Sports Resort will likely fit in here.

Mario & Sonic @ the Olympics has somewhat better legs. As does Mario Party 8.

 

Of Nintendo's top 10, only 2 games are not outlegging Super Mario Galaxy.  Super Smash Bros. Brawl, which practically ties SMG, and Twilight Princess, which is a Zelda title - Nintendo's perhaps worst legged multi-million selling franchise.

 

But again, that actually fits with your poll, because why do Nintendo's titles have such good legs? Definitely word of mouth.