Their milkshake selection is crazy. Go here only for the milkshakes(especially the peanut butter fudge one).
That being said, the cajun fries are OK, the hush puppies are unimpressive, and the Cook Out style burger is a typical fast food burger. Its a little better than steak & shake but that isn't a tall order.
See if they can give you a spoon with your milkshake unless you have the soft palate muscle strength to suck a golf ball through a garden hose*. It is very thick.
*from Full Metal Jacket.