As much as people fixate on particular titles as a representation of Nintendo's market expanding strategy which I think misses the point ... The strategy is about making videogames much more accessible to people who are currently not gamers. This means that they will attempt to make games which are interesting to non-gamers but that is not the entire focus.
Most of Nintendo's Wii games are taking the Wiimote and using it in a way which is very straight forward and far more intuitive than a conventional controller; this means that even games like Metroid Prime 3 are far more "Casual" than a similar game for the PS3 and XBox 360.







