It's an airport. A big International airport. No better or worse than any of the other ones in the country except the layout kinda sucks and getting to your gate is a process involving trams and a long walk. Also make sure you know which terminal you're flying out because it will take at least a half hour if you're at the wrong one. Knowing how drunk most people are in Vegas they should have better signage.
Security isn't usually too bad and haven't encountered long waits yet. There Pre Check is usually open even late at night where other airports tend to shut it down by 8pm. I do like that there short term parking is only $3 for up to an hour. I've been to airports where it's $10 to park your car when you pick someone up. Ground transportation can be confusing as is the rental car return signs. Living here now I have most of it figured out but can see how it could be confusing for visitors.