This is a POPULAR spot for kids. It's so much fun for the children and a great place for them to play and experience how things work, certain toys, etc. My wife and I took our toddler and he really enjoyed playing. Yes it was busy, but what do you expect when you go to what is essentially an attraction?
What does reviewer SummerSLogansMom expect? It's an experience, not a restaurant. The fact that they had food was just a bonus! Plenty of places to eat around the museum. Highly recommend if you have small kids!