I've actually flown into Terminal 3 only a couple of times. It's never been super crowded or busy, so there's never really a taxi line. I used to fly Southwest to Vegas all the time and there was always a taxi line at that terminal.
This is a newer terminal, so it's got kind of a shiny new feel to it. Everthing feels nice and clean. I haven't had the opportunity to really check out any of their food options, but I stopped by Coffee Bean before I boarded my flight last time.
Pretty easy and fast to get in and out. That's pretty much the main thing I look for in an airport.