A couple of years ago I went to the Waldorf Md DMV to title and register a car. It took me 4 hours and I had to deal with the most miserable people I ever saw.
I recently bought another car and used two separate tag and title express locations. It was like night and day, no miserable people and courteous service. Twenty minutes and ten minutes respectively, the extra fees were worth every penny.
I guess it depends on where you are. Our experiences with the location on Rte. 29, Silver Spring/White Oak - where they have both the MVA and the emissions testing - have always been excellent.
(It does help to pay attention to the days/times that they tell you are best.)