Which games? I have about a dozen titles and they're all gems.Now, by far lots of Wii games have been bummers.
Anyways, I guess my ultimate wii game would be a Samurai Showdown title that uses the wii in a similiar method as Mortal Kombat Armageddon, but requires you to be faster paced and more skilled. The controls would also be more subtle and intuitive.
It wouldn't be online, since wifi would blow for an online fighter (When milliseconds count, wifi is unreliable.)
Oh, and T for teen, since I likes my blood but Samurai Showdown doesn't use an excessive amount of it.