I'm not planning on getting the Wii for a while, but I wanted to try it, so I went to the EBgames in my local mall. So I ask to borrow the remote. 
 "Sorry, the batteries are out of power"
So I played some Off-road Truck game on the PS3 instead.  I turned the Motion Sensing on, and pretended I was playing Excite Truck.  The game even had overheating, speed boosts, crashes, and all of that stuff.  
Half the playable consoles I see at stores are unplayable.  The Wii demo units may do even worse...