Why 4 stars? Because it's the ambassador of the strip.
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I have no idea what it's like to be a regular traveler from this airport, but what I do know is this:
When you're excited to be making your first or rare visit to Vegas, what is cooler than stepping off the plane and seeing/hearing slot machines going crazy? You are looking dead-on at the strip from the windows of the airport, and immediately upon slots as you walk out of the air tram.
I don't really know of a cooler way to start off a trip. Judging by the other reviews, it apparently gets old quickly. Maybe... but maybe I'm amused my colorful flashing lights and sound effects more than others.