This place is right outside of my work so I pass by it all the time. There's Chipotle right next to it ( the only Chipotle in town if I remember correctly), and I always go straight to Chipotle in stead of this place.
And you know what, after trying Mr. K's today, I will continue to choose Chipotle over Mr. K's.
I order the Big K's burger and Homemade onion rings. The food is not anything special, definitely not as good as Five Guys. Beef patty tasted bland and without condiments I wouldn't able to push it down to my stomach. Onion rings is a little overfried, and overpriced (more expensive than a beef burger? and only has 8 rings in it? really?).
I see this place probably is recognized for its sentimental value and not really the food.