(Well, to me all accordions sound alike, and the sweetest, most enjoyable sound I can imagine is the sound they would make burning in a giant bonfire.)
As a counter-argument, I'll nominate accordionist Teodoro Anzellotti playing works like John Cage's Dream and Souvenir. He produces a somber yet compelling mix of simplicity and vibrant tone.
For the record, I don't hold any strong opinion about those Polish (German?) polka tv shows from my youthful days in Michigan although I liked the pickled bologna.
johncage.info on Dream:
Throughout the composition resonances are sustained, either manually or with the pedal. The music is essentially a single melodic line, except for the last few bars.
Men inbitna Cage-fans sparkade bakut, såklart.
The machine gives this English equivalent:
But inveterate Cage-fans kicked batch out, såklart.