I LOVE this airport... because when you arrive, the sounds of slot machines welcome you to the FABULOUS city of Las Vegas. The airport is larger than you think with multiple terminals. I have never waited long in line for airport security or to check-in. The Southwest/Virgin America terminals have better and larger security areas and are more convenient since you don't need to take the tram, BUT the United Terminal is newer! Lots of places to eat and hangout, walk around and explore.
PS I also love this airport because I have won over $1000 at the slots.. WOO!!