63/89, or 71%. But this includes all games gifted to me and games my girlfriend received for reviewing and thus being sold shortly because of crappyness.
If we only include games I actually like, then 47/73, or 64%.
In my opinion, there are tons of awesome 3rd party games on the Wii, just not much big, mainstream blockbuster games like you find on the 360 and PS3. Most good 3rd party games on Wii are niche games with little mainstream appeal.