"Also, certain sprites kind of don't look as good at high resolutions." <-- That alone instantly turns me off the whole Hi-res craze people have accquired. Also if the sprites don't look good, how can we be sure if tilesets will look good? Will we have to make sure our tilesets are "Hi-Res Compatable"?

These potential graphical problems in a world where levels ratings can be swayed by eyecandy, can produce flawed ratings if played in a higher res where a tileset looks bad, and even in a lower res if a tileset was made speficially for a hi-res without any care to see if it looked as good in a lower res.