Crappy service, food okay, but really crappy service. Waited 10-15 minutes for server and it wasn't even packed, had to ask for server to order. Poo. Burger was pretty dry, not cooked as requested. Lame 2 stars - will avoid. Good for typical yelper looking for convenient, cheap food and indifferent to service at odd hours in Las Vegas. But this isn't a place you would seek out.
P.S. Your grandparents will love this place and probably give it 4 stars and remember the name of it.