My kids really liked it. In fact, DD14 went in DC last April. She recommended it, specifically for DS12, for our JUly WDW trip. In Feb., we're doing an Orlando, non-WDW trip, and the kids have asked to do Medieval Times again.
Personally, I thought it was okay--fun, but kind of pricey. But DD6 really got into it, screaming "Kill him!" and stuff--she's the sweetest thing, I didn't know she had it in her! And DS12 thought it was fantastic.
I thought there was plenty of food, even for my bottomless pit son. The meal was pretty forgettable, though.