Oddly enough, I think MGM has the weakest lineup of all the parks for CS food. I can tell you that our last experience at ABC Commissary was a huge disappointment. Bleah. Not terrible as in inedible, but just bad for Disney.
Backlot Express - we stuck to the basics, the burgers, chicken strips and fries were hot and fresh, the beer was ice cold, and it felt great to sit down in the air conditioning! I saw a turkey on whole grain bread sandwich that looked very good as well. The mini chocolate bundt cake was moist, best CS chocolate cake of the week (DD was on a quest to try them all )
we were there right when it opened at 11:30, we were starving and it hit the spot!