McCarran Airport is just a-ok.
The location is at the end of the Vegas strip so if you are staying on or near the strip it isn't too bad of a cab ride. That is, unless you get a shady cab driver who takes you out to the highway and back on the strip which puts more $$ in their pockets. Unless something is going on that is unusual there is no need why your cab driver cannot take you from the airport directly on to the strip so FYI. Exceptions would be if you are staying on the end of the strip near the Wynn. The best advice is to evaluate which casino you are at in relation to which end of the strip so you can avoid your cab driver taking the highway route.
Getting from the airport to your destination via cab is usually a sort of nightmare (especially in the warm months) as the cab lines are looooooooooooong. Be prepared to wait.
Of course most people are tickled that this airport has over 1200 slot machines including at the terminals so you can gamble up until the last minute before getting on your plane.
Baggage claim takes FOREVER at McCarran since most people who come through this airport carry a lot of bags. Baggage claim is also massive with tons of turnstiles so be aware.