ok that's understandable. The iliad and odessy will teach about old mythology, and can be entertaining to the right person. One could derive some life lessons from them as well. Would I characterize them as necessary reading for adults? I'm not convinced, personally.
Loads of fictional works are just facades for a greater truth: a statement on the current political climate, a metaphor for human behavior, etc etc. Heck even a 'dreaded' Stephen King work will have a granule of applicable truth for the reader to take home, if they are looking for something out of it. for example: let your dead pets stay dead, and everyone will be better off.
I guess when I wrote 'entertaining', I did not mean 'void of any relevance'. it was more of 'when I put it down for the night, do I want to pick it back up the next day, or must I force myself to grind out the rest?'