This is one of those places that you will never go out of your way for. But if you're in the neighborhood and you're getting hungry, it'll be one of your first choices depending on your mood. Best thing about this place: build your own burger. Yes, nowadays you can do that at other burger joints and create your dream burger, but I'm pretty sure you can't do it for under $5 at those other places.
Rum Runner has two sections, a bar and a restaurant. It's a typical PT's type bar with several flatscreens showing sports, a couple small sized pool tables, video poker at the bar. I always sit in the restaurant section because there is a wall and a door separating it from the bar area, which means I don't have to deal with smokers while I eat. It's set up like a diner, with the corresponding old diner waitress serving you.
The burgers are slightly above average, but it's the slightly above average burger that *you* created at a value price. When you sit on the restaurant side, each table has a card with all of the possible ingredients listed in list fashion. Start at the top, and work your way down, circling the ingredients you want. Your meal will be around $5, including fries and drink. Thats just the way it is, with additional toppings either being free or very cheap. I believe the other side of the card lets you create your own wings, but I haven't done that.
If you're nearby and craving greasy food (ie drunk) this place will satisfy your cravings.