I just found out a few days ago that my grandmother, who is in her 70s, used a Nintendo Wii at my brother's house. She is a golfer, and she played Wii Golf for her first time, and she proceeded to play extremely well, and easily beat my brother.
So, Wii is full of win because my non-gaming grandmother can play, and succeed, at a video game without a bunch of hassle.
It wouldn't matter to her if it could play movies or dispense kittens, and I'd imagine those things don't matter much to others, either. Though, kittens would be cute.