It's probably more to do with lifestyle. I would appreciate the physical interface stuff more if I had more of a reason to use it. I don't have kids, and my fiancee and I seldom have people over (our apartment is a shoebox so it's not good for entertaining), so we seldom "game in a group", so to speak. I've also gravitated away from solo-gamer fare like Mario Galaxy (Metroid 3 being the exception, because I love its game world), and moved into more online multiplayer co-operative stuff. This is why my favorite Wii game is Mario Kart Wii...it lets you get online and play with other people, not co-operatively, but it's group gaming nonetheless.
I love group gaming, but more as a virtual group than a physical group nowadays. That's a product of my age, since when you're in your thirties your friends move to different spots on the map and start doing their own thing. You don't all live in the same dorm or apartment complex any more, for example.