Not exactly true. If you listen to only one Sirius station all the time, the rotation isn't much different from a typical classic hits station. What really freaks me out is when I hear the exact same SEQUENCE of songs, in the exact order. That's something you rarely hear on broadcast radio.
That is what annoys me to no end. The horizontal and vertical rotations on the decade channels are just horrible. They seem to have no clue as to how to make sure the same sequences do not repeat over and over. This is one of the two main reasons why I am probably not going to renew on any of our cars when they come up next year. The other is the quantity of minor-hits-that-are-almost-non-hits on the 60's, 70's and 80's channels.