Should I stay in a relationship that is not satisfying?

My husband and I have been together for almost 3 years. We have a 4 month old daughter together. I mean I love him very much but is it worth it? I feel that sex is important between marriages, am i wrong? We argue like most marriages consist of, but I feel very unsatisfied! We have sex about 5-6 times a month. I know it is only a few times and month but that is not the problem. 1 out of 6 times, I actually get to finish during sex! I feel like sex isn't "good." He enjoys it alot, but I do no feel that I enjoy it as much as he does. Should I continue to stay in this relationship being unsatisfied?