If a class is popular, it's popular. People play their jobs for a lot of reasons. Some do it because it's an unpopular job and/or they want to show how special they are to be able to use it, others because they need that job for their raid group, and others do it just for the giggles. Your reasons are your own and as long as you are enjoying the game, I don't think it matters.

That said, I will admit that RDM is one of the most consistent jobs you can use. Very few players play the job poorly, and to my knowledge, most players have an easy time making a large contribution with the class. For better or for worse, it seems to be a job with a low skill ceiling and a high skill floor. Ninja (rogue) and Bard, in comparison, have higher skill ceilings and lower skill floors. All three have unique play styles and you're free to choose what you want.