D's is a neighborhood classic. They're known for the hot dogs, pizza, and bottle beer selection. I'd say they are like Primanti's. They're typically good, but not a place to take foodies (Franktuary would be the foodie hot dog joint).
The hot dogs are pretty good. If you look at the pictures, it's primarily hot dogs. The french frie servings are huge (but not Oakland O huge). Pizza is good. I'd recommends staying aware from the other options. I haven't been impressed with the hoagies and wings.
As a note, be careful with some of the bottles. I've had some old ones on occasion when I've picked some of the odder selections. That being said, this would be my pick for a bottle bar. They don't have the massive Belgian selection that is Sharp Edge, but the service is 10x better.