My primary care doctor retired when ACA went live.
I have been seeing Dr. Bartozic (sp?) with Med-Star for my cardiology care and like him. Since I needed a new primary care, I figured I'd try out the new Med-Star office in Charlotte Hall. My Dr is from germany (I believe that's what he said), married to a U.S. military member. He was funny ("You're a couple inches too short" in reference to my being overweight, which got a chuckle out of me), easy to talk to and seemed very competent when I went in for my annual physical. I like that my cardiologist and primary care both have access to my records since they are part of the same parent org.
Making appointments is very easy too. I called them up and asked for an appointment, and they said they could take me that day, but I needed the next day, and that was not a problem. Got to the office, filled out the requisite paperwork and was taken back before I even finished the paperwork.
I do recommend this office.