Well, if you don't like MadWorld, or No More Heroes, or Super Mario Galaxy, there's really no point in owning a Wii.
Just my 2 cents.
But to be on topic, I personally highly recommend MadWorld, No More Heroes, Super Mario Galaxy, The Legend of Zelda: Twilight Princess, Okami, Zack & Wiki: Quest for Barbaros' Treasure, World of Goo, Punch-Out!!, Mega Man 9, and Super Paper Mario.
Seriously, give games a chance before you judge them.