Jason,
There is always an exception to the rule, and I am glad that you are finding good coffee. Needless to say, personal preference plays a large role as well.
Personally, I eschew blends, since I am a bit maniacal about appreciating the unique
terroir, if you will, of each origin. The exception is espresso, which benefits from blending since the high-pressure extraction can accentuate certain notes of coffees to an unpleasant degree.
In my experience, Indonesian coffees like Sumatras, Javas, etc. are often over-roasted. Part of this is that the preparation of the beans from these regions can be poor, leading to some nasty aromas/tastes (burlap bags, dirt, etc.) which need to be burned off by a high roast level. Part of it is also the "manliness" factor, where many people like low-acid, rich, heavy coffees such that they can put lots of milk and sugar into it.
Consistency can also play a role, such as the Charbucks case. If all you taste is roast, it is easy to be consistent. Try that with a light roast where the unique character of the coffee itself plays a larger role, and it is much more difficult to get consistent results
Decafs are often another dumping ground, where producers take their lower grade coffees and send them off to the decaffeination plant. After all, if the poor schmuck is drinking decaf, he deserves it!
Anyway, we are lucky to have lots of quality roasters out there who source excellent quality beans and roast them with respect. Before I started home roasting back in the day, I appreciated coffees from Intelligentsia, Counter Culture, Ristretto Roasting, Stumptown, and others. Good luck!
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