I get the appeal of it,and indeed when it happens its fan,but the thing is it only works when you have other people with you. But when I can be with other people I tend to do other kinds of things. For me gaming is for when I'm not in the mood of going out,or nobody from my pals is available at the given time I'd like to.
And except from that,unfortunately the fact that Wii missed a lot of great titles makes it a complimentary console,not a 'main console' for somebody,IMO.
Yeah,Mario,Donkey Kong,Metroid etc are fun,but so do are Elder Scrolls,Wolfenstein,Duke Nukem,Battlefield,Far Cry,Fallout, Tomb Raider,etc...
:/