However, I enjoy ghost types a lot. Its easy to see them other then just warriors but myths and legends, and create your own story for them. Maybe drifloon came from a town that popped balloons for religion O_O. Isn't ninetales alive because of the souls of nine saints? (ninetales should be part ghost!) Spiritomb is honestly just asking for it, and a good background for it already exists.
Ghost pokemon I believe have a lot more to them then the others, well besides legendaries.