For me the most important feature of McCarran is the location, right in the middle of town. I'm so lucky to live 15 minutes from the airport!
My biggest gripe is the passenger pick-up area Nazis who won't allow us to stop for even one minute to wait for our guests. Yeah, I guess it's their job, but I wish the airport would put some effort into making this easier for us instead of forcing us to drive in circles around the airport until our passengers arrive. If there's a designated waiting spot for cars I've never seen it. Short term parking can be a mess & it's hassle to pay at the kiosks.
Taxi lines are ridiculous sometimes, but thank you Uber! It's a breeze to call you & meet you there.
Security lines are also sometimes long & frantic.
Overall, I don't dread traveling in & out of McCarran, nor picking up & dropping off guests.