I do have to say that is, in fact, hard to find a spouse. This is a specialized site for Catholics, so there may fewer members here than on the some of the other bigger name sites. Having more members doesn't necessarily ensure dating success either. A lot of people have restrictions on a long-distance relationship due to their personal obligations and there may not be many CM members in their area.
Being on a dating site for a while is not an indicator of lack of seriousness in the search for a spouse either. A group of my friends discussed this not too long ago (in person at a local gathering). A friend of a friend, who is not Catholic, was on a popular secular dating site for ten years. She is now engaged, but she did not meet her fiance online, as they were introduced by other mutual friends. It turns out that they were classmates in elementary school, they had some things in common and their relationship blossomed. A membership on a dating site is not an order form to purchase a boyfriend/girlfriend/spouse; it is just one tool that you can try to use to meet people.