I adore this airport. It's kept clean. There is generally plenty of seating at the gates. No matter your terminal, there are a few options for food and drink. The bathrooms are also clean. All of the directional signage is clear (I've never been lost there!).
I look forward to the slot machine sounds when I arrive! They're almost inescapable; if that bothers you, McCarran obviously won't be your cup of tea.