With all the utility shaman come with, I always feel useful in raids and dungeons, even if I'm not top dps. Then there are moment with storm keeper a and chain lightning and having arcing lighting tagging EVERY mob on your screen just feels good.
Resto isn't the best healer but it is still one of the more enjoyable healing specs in my opinion weaving AoE healing into single target healing, and pumping decent dps when your raid learns to stay out of the fire.
Might not be the best at anything, but great at everything