If you accept what you're getting - and considering the tradeshow atmosphere - this place is decent. Extra star for being a decent place to eat.
The following cuisine types were noted
American Grilled Meats
American Chinese
American Italian
Rabbit food
I'm a fan of the rabbit food, even though it can be a 15-30 minute wait during peak lunch hour to start building my bowl of bagged mixed greens, artichokes, canned olives, onions, tomatoes, cucumbers, and croutons and garbanzo beans, it's a faster line than the other food stations.
Cashier stations are efficient as possible (considering the chaos) - it most of the cashiers are retirees making an extra income. But I normally wait in a cashier line for about 3-7 minutes - pretty typical wait time for here.
There are typical tradeshow prices - which is about 30-40% higher than what you can find in say a regular grocery store, or a strip mall, but that is life in Vegas.
Normally, the mess hall is filled with every single seat taken when I stop for lunch. What I usually do during lunch is take my food outside and take one of the benches along the perimeter of the building and enjoy the sun. If there's no benches, there's always the grass to sit on. :-)
Tip: Please - don't be a prick in while in line. It's a tradeshow - everyone is wired and stressed. People need to lighten up and take it in stride.