I would say, medium roast is difficult to get right, too often, the inside part of the bean is like charcoal. Dark roast is plainly bad, when I see really shinn

I would say, medium roast is difficult to get right, too often, the inside part of the bean is like charcoal. Dark roast is plainly bad, when I see really shinny beans, I know it'll be awful. I rather have robusta blend then a dark roast or badly roast medium.