At HS you dont have many options. For TS i'd recommend 50's prime. Good food, great prices. You can also sit at the bar and eat if you cant get an ADR there.
Sci Fi is good too, but the food at 50's is better. But the atmosphere at Sci Fi rocks!
For QS/CS meals, there's nothing special at HS. I would never recommend Pizza Planet to anyone, disney pizza is awful. Backlot Express isnt bad, but its not the greatest either. You might be better off taking a boat ride to boardwalk from HS and eating a beaches & cream.