The wii sold most by appealing to the mass market. This is true...
Kind of how a toyota corolla and honda civic sell more than BMW and Mercedes. Yet those 2 car manufacturers get much more press and praise by majority of car enthusiasts.
Also Wii has mostly been neglected by 3rd party publishers...so maybe its a bitter-sweet victory for nintendo...and wii gamers in general.
I mean...Resident Evil 5, GTA4, Final Fantasy 13...all missing the Wii. Those are some industry leaders right there...