EdgeOne

 Great list! Zoo Keeper is classic. Why not provide a level to display and play existing XBLA games (doesn't need the same online interaction, rewind, etc.)  or, at the very least, the arcade classics I already purchased like Track and Field, Frogger, Pac-Man, Contra, Gauntlet, etc?
 
As it is now, it's pretty weak.  And how about pinball games?!  And a real claw game?  Sandbox exploration maybe?  Forget all that.  How about simply listing the game name on the screen instead of trying to make out the name on the cabinet from a distance with annoying avatars in the way??
 
And sorry, but Atari 2600 and Intellivision are NOT arcade games!!  I lived in the era of those consoles, and while fun at home, they SUCKED compared to the arcade games of the day - we went to the arcade to get AWAY from the home systems, NOT to play them!
 
This is a video game museum , not the fun arcades of the 70s & 80s I experienced.