I frequent McCarran a lot because I travel often. McCarran is unique from most airports I've seen. It might have to do with the fact that it's Las Vegas and that in itself is unique.
It's very lively and I don't think you will ever get the same type of ambiance/atmosphere from any other airport and like I said I have been to quite a lot of airports.
There are 3 terminals with terminal 3 being the newest one. I don't particularly like terminal 1 it's a little run down. Ofcourse terminal 3 will be the nicer one, very sleek. The other two terminals have a lot of options as well when it comes to dining. Every terminal has slot machines on every corner and there is free wifi!
My only thing is that when you arrive at times they do not let you know where your luggage will be. Arrived in terminal 1 a couple weeks ago but my luggage was sent to terminal 3 and I spent an hour trying to find out where it went.