This is totally like my son.
Whenever we do anything...go to Disneyland, go to school, ANYTHING - if I ask my son how it was, he typically says "GOOD" in a pretty matter-of-fact, flat voice. That's it. No elaboration necessary. Later on, as time goes by - I can always tell if he really liked something because out of the clear blue sky he'll begin to tell me a detail about something that happened, and then you can't stop him.
I know not to ask him what a movie was about, because if I do - he'll just tell me the entire movie - not leaving out one single detail. Oddly enough though, he sticks to the facts, there's no analyzing of characters or telling how someone FELT. Of course now I know that's because he's an Aspie.
Interestingly enough, at school they take AR tests for reading. I think a lot of US schools do that now, where they read a book and then take a test about it. The test isn't based on comprehension as much as it is based on reading for detail. My son does very well on those tests. However, ask him what a particular story is about, and he doesn't know how to share it. He just relays exactly what he just read. I'm sure that's going to be an issue when it comes to 4th grade and summarizing.