Paul's Place has the best burgers anywhere. There's actually nothing else to say, but these reviews are supposed to be 50 words, so I must go on.
They are the perfect size and always perfectly cooked. There is a huge variety and you can get just about any topping you can think of. They're also cheap and the atmosphere is combo diner and amusement park. I actually miss them when I go too long without and don't want to leave the neighborhood to a place where I can't have them every weekend (if I so choose).
Apparently, they also make great Philly cheese steaks and serve omlettes, but I see no reason to try anything other than the burgers.