I mean no disrespect when I say this: if you are unable to perceive the subleties of which I'm writing, I feel pretty sorry for you. There are differences within genres of music that Pandora can't quantify (yes, Bad Religion and Pennywise are different) and Pandora very obviously attempts to quantize listening preferences toward the most popular examples of a given genre.

(Your analogy is pretty weak, too, because those subleties exist within food as well; a Pandora-for-food would give you wet Memphis barbecue because you liked dry, and would steadfastly refuse to stop serving you wet barbecue no matter how many times you clicked the down-fork.)