As long as you are a satisfied customer you haven't.
Starbucks is the Wal-Mart of coffee. It's mass-market. Did you happen to see the hour long show on The History Channel on coffee?
It's 'coffee' on a good day, you are paying for convenience, not product.
I've been buying Starbucks beans since 1991, when the company was small. The quality of their beans has not changed IMO. Just because they are hugely successful and markets to large market does not mean their product has suffered. Do you think they buy less quality beans now than before? How does that work? And why are you so bothered about what others like or don't like?