I am truly glad to hear that you all feel that Sirius' sound quality is awful.  Low bit-rate MP3 (like 64K low) is a good analogy.  I've noticed that stations that have fewer listeners get lower bandwidth, and hence, poorer sound.  The Jazz stations are almost un-listenable, as is the Sixties channel.
I hear that @jafant . I took a beating on their stock when they merged. Management manipulated the stock then looted the company. 


I do enjoy satellite radio in both of our cars.  A friend has one of those home-based receivers and the sound quality is really pitiful for serious listening, OK driving down the highway!
Pandora streaming quality is mediocre at best in my MCIntosh based system.Added a music fidelity V90 DAC.Some improvement but still inferior to analog sources.