This is my go-to in Vegas for miso ramen; their corn butter ramen is also good, and in general Ramen Sora is a good choice for those who like lots of ingredients in their ramen. It's nothing that will blow you away, especially if you're a ramen addict who typically eats at top spots in Japan or at least in cities with bigger Japanese populations - but it is a very reliable and consistent spot that gets the job done. So it does deserve the 4* in this city.
I typically get a deluxe with a miso base and add more bamboo shoots and seaweed. I also like their pork fried rice, but the portion size is very small, especially for $6. I'd pass on the gyoza. At times, they do have off-menu special apps or drinks (usually a handwritten sign on a wall somewhere), so keep an eye out for those.
I would probably go elsewhere if you are not going for the miso base or corn butter ramen.