Update from Spotify staff:
"Hey everyone! As this idea is quite vague and it's difficult to say when it has been officially implemented, we're moving it to the Help boards. From there we will continue to pass this feedback to the Radio teams--who are continually working to improve the Radio experience.
Please keep leaving your feedback here, including the following details:
First of all, awesome program. With that being said, the relevance of music that the radio plays is really poor. The Music Genome project has a significantly better way of picking songs to play when forming a radio station in terms of relevance that the station was set to. Currently, when picking a 'Skrillex' radio station, the thing plays one skrillex song, then is giving me Beyonce, Chris Brown, and music that ultimately has nothing to do with dubstep and dirtier electronica.
If you can integrate a stronger, more relevant radio I wouldn't have to use Pandora or Last FM as much. Even Window's Zune has the DJ feature where you can pick a song, and it then plays songs of similar nature. Unfortunately your radio is like listening to MTV or something that plays one song the user enjoys, then songs that fill the space between the next more relevant song.
Just as I write this, Kelly Clarkson comes on the Skrillex radio station. This is not pleasurable, although makes me laugh a little when a completely irrelevant song comes on (sense of humor helps). Maybe this is a product of what kind of licenses that you have with music lables, but it would be a good idea to integrate a better radio service into Spotify if possible, so that people dont have to switch between programs for radio and music streaming.