I have one in Columbus, Ohio which I have gone to no less than 50 times. They have the Fork & Screen, which is 18, but kids can come in with an adult. And the Cinema Suites which is the luxe version and has the recliner seats and that's 21+, no one under 21.
The food is definitely All-American, but I would say it elevated over fast food. I personally love the app samplers (they can sub for meals!), the wraps, and the pasts dishes. My sister LOVES the beef tips and my dad swears by the fish and chips. Always very fresh when I go and the desserts are very yummy too!
I think it is SUPER fun. The Fork & Screen has less nicer seats, but it's a wonderful movie experience because there are so few seats in the house and I find it to be a lot of fun.
I say go for it!