I've seen that Consumer Reports article, and I would agree that Starbucks coffee used to taste burned -- I've heard that Starbucks over-roasts their product to cover up the fact that it's actually stale. Certain coffees (Italian roast and French roast) are supposed to be darker roasts -- meaning they can taste burnt if not properly roasted.

However, a few months ago (after the article), Starbucks started serving "Pikes Peak" as their house blend, and it's much better. More flavor than 7-11 or McDonalds, but not the extreme bitterness that Starbucks used to have. Today I tried Starbucks' Casi Cielo, and I've very pleased with it. McDonalds still makes their coffee too hot (despite consumer complaints and lawsuits), and their prices have climbed dramatically since they changed to premium coffee.