I think a lot of people give this place a lower review because it's not beating you over the head with gimmicks like Gordon Ramsay is across the street, plus people seem to hate Bobby Flay for whatever reason.
Me personally, I like good food and don't give a shit who's cooking it. The place is clean, the menu is short, and the product is simple in a fantastic way. It's like people don't understand that this is supposed to feel like a blue plate special/simple lunch counter/diner style.
The burgers come with a variety of toppings, all of them fantastic (that blue cheese, holy shit) but are presented simply because they want the beef to shine through. You can tell the quality of the beef in every perfectly-medium bite. The bun is nothing special, but that's ok because it's essentially treated as a vessel to deliver that amazing beef to your mouth.
It's not gimmicky and it's not flashy but damn is it good. Take the lines at BRGR, I'll stay here.