Thanks for the feedback! I've looked at the Smart Playlists problem, and unfortunately that's a problem with iTunes that wouldn't be easily fixed without a patch to iTunes from Apple. I've sent this in to Apple as a suggestion for the next version of iTunes, but obviously it's up to Apple whether this change will be made.
For now, there is a workaround, albeit a complicated one... This is assuming that you want to make a playlist that includes all Country songs rated 60 to 80.
1. Make a Smart Playlist that includes all songs that are rated greater than two stars, and less than five stars. Set it so that it matches ALL of the conditions. This playlist will give you everything rated 60 (three stars) to 80 (four stars.) Name it "60 to 80" or something of that sort.
2. Make another Smart Playlist that includes all songs where Genre is Country and Playlist is "60 to 80," or whatever you named your last playlist. Set it so that it matches ALL of the conditions.
This playlist will serve as a smart playlist, but with an unfortunate side effect of crowding your iTunes library with yet another playlist.
This fix will likely also work with iTunes Rater or any other program that supports extended ratings.