I've been using it a bit more lately. It has some great games, Galaxy, TP, Metroid, Brawl and Kart to name a few. I've also picked up Tiger 10 with the motion plus, and it's pretty awesome.
That being said, I can't come to see the Wii as a "real" gaming machine. Other than Zelda, none of its games can really hold my attention for prolonged periods of time so generally I play sporadically. Since I'm not obsessed on a game currently (stupid delay on Dragon Age!), my Wii is seeing more use as I try to complete those games that I only play once in a while.