Yeah, it's an airport. I have been to Vegas twice lately--once in May, and just last week. It actually seems like the security has its act together more! Last May, it took twice as long to get through security as it did this time. Last time, it was kind of a cluster... Much better this time around.
Like other posters have said, you are sort of limited in dining ($16 for a cheeseburger?! LAME!) and do NOT go to the Chili's Too. They have a limited menu and terrible service!!!!
But the bathrooms were clean, and security had improved, so that's pretty sweet!