Richard - when I first started in photography I took crappy pictures. I then heard about the "rules of composition" and found that I was shooting slightly less crappy pictures.
I then started looking at pictures by the masters. both the old and new and discovered that they were getting great images and in most of the shots they were often ignoring the "rules of composition". I then began to suspect that the rules should not be followed, but instead, it made more sense to come up with compelling images that drew the viewer's eyes into the image and had kind of emotional impact on them.
Now that I ignore the so called "rules" I'm taking a lot better pictures.