I, like others have stated, do not feel there are certain patterns that are not fish producers because no fly tier is going to go to the trouble of creating a pattern just for the fun of it. Most patterns were created to imitate a certain food source in a particular body of water and were very successful but not successful in other bodies of water because the food source it imitates does not exist in that particular body of water. As an example, there are some beautiful stonefly patterns out there but if your favorite fishing water does not contain stoneflies, the pattern will not be much of a producer for you. One needs to stick to patterns that imitate a food source that exists in their water they fish.

Just my thoughts and nothing more....