Just wanted to chime in as somebody who has received employee discounts at both UOR/WDW.
Eating at Mythos as a UOR employee costs about the same as a trip to Friday's.
Eating at any Epcot restaurant as a WDW employee costs about double that.
Even without my discounts, I never looked at the Mythos menu and though it was even close to expensive. Seems like the same prices you would pay outside of a park, and significantly cheaper than anything Disney offers.