i say warioware isn't that casual because from none of the people who bought wii as their very first console found warioware to be enjoyable (and it comes to... about 20 people). most found it completely pointless and actually too hard, and a couple who borrowed it got stuck on some levels that they couldn't beat the "boss". personally it's my most enjoyable experience of all video games i have ever played, but not for anybody that i know of.
warioware is still casual in the sense it's accessible, but it's not "that" casual. the campaign, which you have to finish to unlock to multiplayer modes, is far from casual. you need to be pretty dedicated to put in the time just to unlock that mode, which is utterly ridiculous.
EDIT: example of a boss they can't beat: the light sabre boss. "it's so hard! i always end up dying." and of course, they stopped playing the game, period.
the Wii is an epidemic.
