Nintendo gamers are not considered CORE gamers according to the NPD (Source included!)

[JWeinCom]

DietSoap said:
You completely took that out of context. They didn't say Nintendo gamers aren't hardcore gamers by default, they simply said that if they don't at least play on PC or PS3 or 360 (in this case, in addition), then they're casuals.

And that's true. Nintendo fans have to supplement Nintendo consoles with PC or another console less they want to be stuck playing 3 games a year and miss out on every multiplat. Nintendo consoles are side consoles you buy for Nintendo games.

According to the requirements of the article...

If I spend 2 hours a week on Zombi U, 3 hours playing Persona 4 Golden, 6 hours playing Fire Emblem Awakening, and 2 hours playing Tomb Raider, I am not a hardcore gamer.

If I spend  5 hours a week playing Madden, I am a core gamer.