You've got to work hard to get a one-star review in my book, and these guys managed it. It wasn't really the staff's fault; they were overworked with way too many people trying to get their car. I get the feeling they had to go out and clean the cars themselves or something, because they disappeared for ages and ages and getting through the queue took an eternity. It took about an hour to get our car!
It's not like there isn't a million other places to rent a car in Vegas, so just go somewhere with more staff so you can get going with the least amount of fuss.