The main reason to come to Sonic: Tater Tots. Man, I love those little potato barrel nuggets. Simple, salty as hell and delicious. If you need a tot fix, it's a solid choice.
But. . . tots are just a side (well, to most people). Sonic also has burgers and hot dogs, but they're mediocre. But in a town with In n' Out and Five Guys, why would you order a fast food burgers from Sonic?
So leave the burgers alone. Eat the tots for a meal.