For my personal experience, since I've got my Xbox 360 last Christmas, I've stopped playing my Wii entirely... Well, almost. I've played it when Brawl, Mario Kart Wii and Okami arrived, but then I was back on my Xbox 360 after completing them 100%. I was playing other games online (lag free experience too).
I guess that's what drives me away from it: the online experience. I would have wayyy more fun playing Brawl if it wasn't for the button lag and constant screen-freeze. I've tried everything, trust me! I've even wasted money on a USB LAN adapter, but there was just nothing to do about it. Mario Kart Wii is quite good, but it gets boring when you can't talk to the person you're playing against or just add him to your friends list after the race and everything. I wish I could pay Nintendo so they could have a better service... ;_;
But then again, I guess I'm considered hardcore, so what you said above probably doesn't apply to me...
Random game thought :
Why is Bionic Commando Rearmed 2 getting so much hate? We finally get a real game and they're not even satisfied... I'm starting to hate the gaming community so f****** much...
