I applied and interviewed at Marymount last January. I ended up getting rejected, but I'm from Northern Virginia so I can provide some insight.
It's an awesome location, first of all. It's jut across from Washington, D.C, which is where the cadavers are. MU is in a nice part of Arlington. It's filled with 20 and 30-somethings. There are shops, restaurants, bars, and plenty of night life. It's like the big city without the crime. The problem is,you're going to pay a lot to live. Unless you have a lot in savings, you're going to need a roommate. Arlington is not cheap. But if you live too far, you're going to endure a long commute. DC traffic can be horrible, especially in the morning and afternoon, exactly when you'll be commuting.
Tuition isn't cheap either. At $88k for three years, it was the most expensive school I applied to. The program director even encouraged us to accept offers from state schools if we received them. The building isn't nice either. They promised that it would be demolished in the next two or three years, but there's no guarantee.
They're proud of their learning method: "modified problem-based learning." You work in groups to try to figure out the problem. It might or might not produce better PTs, but I don't think I'd want to work in groups that much. The program only accepts 36 students, and then they divide the class into even smaller groups. Keep that in mind. If you interview there, you and four other applicants will practice this model in front of two professors. Be prepared!
In the end, I can't imagine going to MU. I grew up in NOVA so I didn't want to stay in that area anyway. I'm at a school now where classes are so big. I still haven't met everyone. Students in one class mingle with students in other classes, so it's like a large community. MU just seemed to intimate to me.
PM me if you want more information. I wrote an entire report on my interview.
Cf.:
http://forums.studentdoctor.net/showthread.php?t=873328
Kevin