Here are some definitions that might help
Platformers - casual
Non-sim sports and racing - casual
button mashers (e.g. SSB) - casual
Music games - casual
mini-game collections - casual
RPGs, most FPS, some action, simulations, strategy games, some adventure - non-casual
Using that metric only metroid might be non-casual.
Of course, as has been stated previous, if you look at 3rd parties, the situation looks bleak for the Wii.










