Yeah - this is pretty accurate. Much of the dark-roasted grocer brands (like Folgers and Maxwell House) are actually just burnt coffee. I explained why this occurs in my last coffee post. Basically - it masks the fact that the coffee beans are a poor quality and blended with different beans or beans from different regions. So, if you want to avoid terrible coffee, just avoid most grocery stores and don't buy dark roasts.
If you're looking for good coffee, find a nice medium roast, premium or specialty-grade arabica beans. You can occassionally find a decent "blend," but I would recommend a single-origin. Get them in whole bean and grind as you go for the best results - it will keep from staling as quickly. If you don't like hot coffee or want to avoid any of the heat-related health issues, then just cold-brew the coffee. It's delightful!
Make Your Coffee Great Again! All original content, including the images. You really won't find a series like it anywhere else.@jrcornel - If you want to learn more about any of that, take a look at my series,