Monta should get 11*.
It is my favorite place in Las Vegas to have a meal. Oh, flight lands at LAS at 10pm? I'm at Monta by 10:30.
Tonkotsu shoyu ramen with nori and egg. Just do it. Char siu melts in your mouth, broth is incredibly rich, and it's difficult to spend $15 there, including a beer.
Also have enjoyed several of their special ramens -- check the board.
If you're a miso ramen fan (I'm not, but the wife is), probably want to check out Ramen Sora instead. And I tend to steer clear of the sides at Monta -- not because they're bad, but because they are average, and I can focus on the ramen, which is what they do best.