Am I really a fan of the Post Office? Not really. But I feel like this location deserves four stars simply because it's the main location for Las Vegas. From what I've experienced, this is the go-to place if you want your stuff delivered quickly. I'm guessing it's because mail from the other locations have to go through this facility anyway. So you're getting a head start by going to the source.
Plus, this spot works for me because it's right down the road from work. This place should also get you in and out quicker than other USPS offices. There are simply more employees and more counters here. On the other hand, there is an easy to use self-service kiosk in the center area. I'm sure most other post offices have them too, but it's worth mentioning. I usually use that unless I have something unusual to ship (like today).