Certainly some locations are better than others, but he Wendy's around here are quite good for a fast food burger. The burger king across the street from one is the exact opposite of good. It might be something to do with the staff. The Wendy's here hires college and high school kids with decent managers, Burger King is staffed primarily out of the pre-release center.
Dairy Queen trumps all the traditional fast food (not short order) burger joints in town.
Ehh. DQ's only worth it for the ice cream, IMO. Blizzards rock.
Wendy's is generally good, though I typically stick to their chicken, which they do well (spicy and regular filet sandwiches are AWESOME, if not especially healthy
). Decent fries, Frosties are tasty (and I've got that keytag for a free mini-Frosty with any food purchase, DC-area only). Salads can be pretty good, too, and the kids love the chili there.
Local BK is... fair, but I don't go there much anymore since they stopped with the sourdough-bacon burger. If I want a burger, I go to Five Guys these days.
McDs is good for fries and shakes. And breakfast. Best fast-food breakfast, IMO.
No local Arbys - at least, not one I see on any regular basis, there used to be one down in Springfield Mall, but I almost never get down there and I don't know if it's even still there.