Ok, I have only had their food catered for the department's annual picnic, but I would be surprised if their restaurant versions were very different.
BBQ Brisket sandwich: decent- nothing spectacular- the sauce is just ok.
Mac & Cheese: Abysmal. Worse than Stouffers frozen stuff or Kraft. Mushy macaroni with a very processed tasting cheese.
Mashed Potatoes: Tasted like powdered instant mashed potatoes from my elementary school cafeteria.
For me, BBQ the meat has to be good- but the sides are just as important. Good mac&cheese, cornbread, and coleslaw are musts for a good BBQ joint. These sides tasted institutional- like they just got a delivery from the Sysco truck and heated them in the micro.