I rediscovered it after a 3 year hiatus. They improved it definitely, but not as much as I thought. I like how you can set up your channel and add artists. And how a "Like" or "Unlike" is supposed to refine your channel.
But does it? It threw John Michael Montgomery up there so I Unliked the frick out of it. A few songs later, another JMM song. Same for Tim McGraw.
The Prince channel is more like the Michael and Janet Jackson channel. I've gotten rid of most of the Jacksons stuff, but all of a sudden, George Michael showed up. Had to get rid of that with the quickness. I like it especially when Pandora realizes that Prince is associated with Sheila E., Vanity 6, The Time, etc. Then I get some Isley Brothers, Chi-lites, and Teena Marie.
Bob Dylan/Randy Newman/Dr. John are all basically the same channel as well.