My DH and I, and even my parents, always enjoy the Sci-Fi. You have to try it at least once, just for the really great atmosphere. Just go in knowing the the food is not gourmet, just diner-style. Although, when we went this past summer, I really enjoyed my food. I can definitely recommend the BLT soup and the onion rings.
I say just go for it!!! It is really neat inside! If you are worried about shelling out big bucks, go for a late lunch and either have appetizers and desserts, or split an entree. Ya'll will have fun!