Excalibur is seriously lacking in the restaurant department (among other things...) but ABX is a decent quick bite. It's a burger bar, and the prices are not outrageous factoring in Vegas grub in general. They have an adequate array of options, and you'll get your meal in about five minutes. The actual dining room is kind of unclean, and greasy, but again totally passable if you're just looking for a quick cheaper eat.
I was thrilled to find turkey burgers were an option, although I've definitely had better (even at home). My co-diner's beef burgers were very greasy and dripped, but mine tasted more clean and certainly less fatty. Overall, this place is nothing remarkable BUT one of the better low priced options on this side of Vegas. I'd eat here again for lunch or if I needed something to sop up alchohol with.