How to distinguish a good couples therapist

My girlfriend and I have been seeing a therapist for 5 months now. We’ve notice some improvements in our relationship however, I’m not quite sure our therapist is a good fit. I’m not really sure how to ascertain if this is true or not, as this is my first therapist. She emphasizes the importance of communication, using I messages, avoiding always/never, etc. My questioning lies in the fact that I often feel the heart of our issues are never address. We tend to have recurrent fights (although less explosive) and I often feel she strays on lengthy examples of her own life. Is this typical of therapy? Any guidance/suggestions would be awesome