I didn't have the fries, so I likely missed the best part. I had the little bacon cheeseburger w/ grilled onions, mushrooms, relish, tomato and mustard.
For a burger with so much accouterment, it was impressively bland. It's as if the grill hasn't been seasoned, like you would season a skillet. The $6 burger tasted fatty and rich, but not flavorful or savory.
I enjoyed five guys in nyc and nc and don't recall the blandness. For my slightly higher-end burger dollar, I'll opt for In N Out.