Based on price and quality this is a complete five star venture. The inside is a little run down, so I would downgrade to 4 stars for dine in. They cook all the food in an open kitchen that faces the counter, several times I've walked in just as they were putting the final touches on my Mongolian Beef (My favorite) on a fired wok.
The value is amazing (most dishes are under $8 and come with rice and an egg roll) and they can usually wip up your entire dinner for take out in under 10 minutes which makes it a faster than pizza joints and other take out I might consider.
I don't want to be pompus, but I lived in China for a year and every menu item is 85% authentic, which is as close as you will get for Chinese food in the US (at least in my experience.
Save you time and money, skip PF Chang's and head straight for Pearl Wok to Go, just make sure to get it to go! This is my first choice for Chinese food in Las Vegas.