iTunes Song Ratings
Traktor Pro 2 does show the iTunes song ratings (stars), does keep them if you import an iTunes playlist and does allow you to sort by them. However as of iOS7 it seems Apple has reduced the importance of them as they are not shown in the iOS Music app and they are also not used by apps such as djay 2. So if using the rating stars to categorize your music bear in mind they can’t be seen in other apps if you use any as a backup or for general music playback away from the decks.