As far as (international coffee chains) go, starbucks overroasts and undergrinds their coffe but not as badly as dunkin donuts, that stuff is abhorrend, even worse than McCafe andt that says a lot. segafredo zanetti makes a decent cuppa as far as chains go but still a good family run place can beat them.
On a different note, on a recent venture to hawaii, specifically maui, we discovered the maui grown coffee company and ended up bringing a suitcase full of their beans back. Great stuff and their kona is superb.
I think it's fairly safe to say that most, if not all, of the US chain stores' coffee is best left alone. If you're lucky, you have a real, independent little coffee house near you. There is the chance that they might actually know how to make coffee.
I have heard that Maui and Kona coffees are excellent. You confirm that for me.
I've also heard that Maui Wowie is excellent...but that's a topic for a different thread!