I agree. My personal perfect potato is wash the potato, leave wet and roll up in a paper towel. place in bag. I usually use 2 medium potatoes at a time. Cook on high 4 minutes, let cool down, flip bag over and cook another 4 minutes. In most cases, it turns out perfect. I put a fork in one to make sure it's cooked all the way through. If still a little hard, I roll it back up and cook another minute.
Sweet potatoes turn out perfect too!! very soft inside.