Good counter service is very hard to find at the Studios, IMHO. I had an inedible cheeseburger at Backlot Express, and I'll eat just about anything. We found the Commissary to be just okay. Never done Pizza Planet. The new flatbread place sounds interesting - maybe we'll try that in August.
The other parks have such a great variety of counter service - not sure what the deal is at the Studios, there are very few choice with just standard fare (burgers, dogs, etc.) being offered.