It depends a lot on the grinder. On some of my grinders this is true, on others its "bad to awful" from the light to dark roast categories. Also remember, one

It depends a lot on the grinder. On some of my grinders this is true, on others its "bad to awful" from the light to dark roast categories. Also remember, one man's "light roast" is another's dark roast. I consider light something like nordic (and lighter) - what others consider light I would put well past "medium" but before "oily" - I consider "dark" right before beans start to get oily.