I find reviews on airports and other government run operations next to useless. I mean are you going to fly into LA or SLC and drive down to Vegas because they are horrible ... the beauty of no competition is you don't have to worry about customer service.
That being said here are a few pointers to make your experience as painless as possible ... I've flown in and out a McCarran too many times to count. The one thing I enjoy about McCarran is the people watching. All walks of life in one place and often times after a week long bender. Good times.
There is also plenty to do at McCarran while your flight is delayed ... lots of bar/food options and how many other airports can you play slot machines at?
The security lines are not all created equally. The B gates are often times the quickest to get through and since all the terminal connect you can get to you gate this way too.