Come south towards OKC and get off at Waterloo Road (exit 147) between Guthrie and Edmond and have the all you can eat catfish at the Steak and Catfish Barn.
It is right at the exit on the East side of the Interstate. It isn't much to look at but the catfish is excellent. I can't attest to the rest of the food.
I just noticed something in the picture, free Wi-Fi! Which is weird, they don't have two chairs that match or ,evidently, a mop but hey they got free Wi-Fi
BC
Don't know about the steak but the catfish is definitely worth the trip. It's about a close to "ramshackle" as you can find but the catfish is excellent!