I have only a few of Apple's stations on my iTunes Radio and I have been tuning those stations consistently. At this point I rarely need to select "Never Play This Again". Do you create your own stations from artists or albums you love? You can do that and also add related artists, tracks, and albums to the staion to "tune" it better to your liking. You also can tune any station by selecting either "Hits", "Variety" or "Discovery".