The McCarran International Airport is unfortunately a mix of pretty negative things and some pretty nice things which make for a slightly below-average airport experience.
Let's start with the good things first:
1) This airport has a lot of slot machines. if you like to gamble, there are at least 200 separate machines for you to enjoy.
2) There is a very wide variety of shops and eateries in closely spaced areas. For example, there is a Coffee Bean about 35 feet from a Starbucks. The food court in the early-C terminal has a Burger King, Sabarro, a Mexican restaurant, and some takeout place.
3) If you like people watching, this is your airport. I don't think you can find a wider mix of people than in this airport.
4) There is free WiFi that you don't have to jump through too many hoops to use! I'm on it right now and it's working great.
Now let's move to the bad things:
1) This airport has a lot of slot machines. They are loud. They are bright. They take up tons of room.If you're not a gambler, this will be the first thing that you notice when you're trying to take a nap.
2) Like most other airports except for John Wayne in Orange County, all the food is overpriced because they know you're trapped here. Imagine paying $8 for a vegetarian Burger King burger. I'm not exaggerating. I spent $12 on 3 small pork tacos.
3) Because this is a desert (and all airports don't want to lose money) the water pressure here is atrocious. I spent a full 40+ seconds trying to wash the guacamole sauce (from my $4 mini-tacos) off my hands.
4) For obvious reasons, this airport attracts the type of people that you wouldn't want noticing that you leave your wallet pocket unbuttoned.
5) There are only small designated "recharge" stations where you can plug in your laptop and such and they are always occupied because....
6) This airport is very crowded. Don't expect a peaceful experience, but thankfully there is a fair amount of seating.