Overall 3.5 stars
We booked our rental car via Costco Travel online. Took the rental car shuttle over from the airport. Walked into the huge centralized center and headed over to Alamo and lined up. Short wait. The Alamo counter person confirmed us for a full size car.
We signed the necessary paperwork. Then took the escalator upstairs into the massive centralized garage. Walked over to the full size Alamo section to pick one. Where are they? Full size cars? None! Fortunately there was just one couple ahead of us who needed one too. The attendant drives one up. They hop in. Now it's our turn to wait. Another attendant drives up an available car. We load our luggage in and hop in. Ugh. I can still feel the previous renter's body heat (no body odor though).
Exit the garage and make three right hand turns onto the Vegas strip. Head north.
Our car return three days later was fine. Very clear directions back to the Alamo area on the second floor of the garage.