Hi! We took our son to Planet Hollywood when he was nine. He loved it. He did not care about the food quality. He did not care about the wait to get in. (It was pretty short.) He just loved the theme of this restaurant. It was pretty busy, but he did not mind.
We hardly ever go out to eat. When we go to Disney we do not care about the taste of food, we just want the experience. (Because we live in the sticks!)
Anyhow, even though I am not sure how old your child is, why not take him there? If he has requested to go, why not indulge him? As long as you have a good time, just enjoy yourselves.
I am sure that something on the menu will appeal to everyone.
My son, who is now thirteen, still wants to go there. (And we have done that.) He is attracted to the globe theme. Even if this place does not meet adult standards for eating, why not do what your child would like?
Just my two cents.
I wish you the best!
Take care!
Jennifer