The closest thing you can get to a fast-food burger anywhere near State Street. Five Guys is just pure, unadulterated grease - look at your burger next time you stop by here and just take a minute to contemplate why you are putting this into your body. There is literally some kind of industrial extra-fat mayo in there.
If you're like any red-blooded American and can let this thought pass in an insignificant whim, then you're in luck. Five Guys makes a damn good burger; The patties are thinner, but are extremely juicy. Unfortunately that means that in order to get just as full, you buy more food and end up paying just as much as you would for a bigger burger elsewhere. Not that that matters - this big chain restaurant is just about stomping on half of the bars in town.