[hinkley]

As I mentioned elsewhere, quality of a recipe can't be plotted on a line. It's at least a 2D space. The wrong mix of ingredients can be bad, but the instructions can also not be repeatable. And repeatability might even have dimensions of its own. Some ingredients age better than others, for instance, and some measuring systems are more consistent. Baking powder and spices are examples of the former, and brown sugar for the latter, or possibly both.