My wife and I still play ours very regularly. Rhythm Heaven took up a good few weeks recently. Played through Twilight Princess and Wind Waker (GC game on our Wii) again before that. Started over on Mario Galaxy recently, as well. Most immediately my wife is going crazy with Monster Hunter Tri while I work, but I've been…
I'm certainly not about to dispute this because my Wii does play my GC games, but technically they dropped that functionality from the newer Wii models. For whatever the hell reason.