Welcome to Vegas, where you can't even walk to the baggage carousels without bumping into a slot machine.
As others have noted, this is a modern airport with none of the dated industrial vibes that many airports (cough Dulles cough) suffer from. It's roomy, well lit and easy enough to navigate.
My only real beef with McCarran is that you're inundated with bright, loud advertising the second you walk off the plane. Want to stay at the Wynn? Looking for great night life? Go to the local gun range to shoot machine guns? Restaurants? Show girls? You've seen it all before you even get to the baggage claim.
But, I'd happily take this over the sterile funk of Dulles.