I have been to a few out of the way SC's but without a doubt Joplin takes the cake for the Supercharger to avoid. It is in the parking lot of a condemned restaurant right next to the now abandoned Joplin Convention Center. No one has mowed or maintained anything, and the doors right next to the the chargers have warnings from the health department that it is an unsafe property. You have to wind around through a deserted little road to get there and there are zero facilities, unless you consider the old abandoned loading dock full of trash around the corner a good place to go.
It does get used as I have twice run into others there. If you are on I-44 and can charge at the Hard Rock in Catoosa, or Springfield, MO, I would skip Joplin.