I saw that exhibit. It was disappointingly cryptic, but I learned a few things. And I got an awesome overpriced keychain from the gift shop
Mythical creatures have played an important role in various cultures and mythologies. History is more than just wars and famous speeches, and fantasy/mythology deserves to have the roles it played included and examined.
That said, Animal Planet used to include educational shows about wildlife. Now it's basically all pet rescue stories. I haven't had an opportunity to watch TV at all this year, so I can't really say if the History Channel is at risk of becoming that off balanced.
Is it just me or has there been a decline in educational entertainment in general?