Although I am not a huge fan of Lanzhou style Ramen, I did grow up in China- and have had fair amount of encounters with Lanzhou Ramen.
I have to say their stuff is very authentic, for better or worse, it is how it supposed to taste. For those who complain about the broth being clear: you are not supposed to drink the clear soup of Chinese Raman in general- if you want to drink the soup, get out and find Japanese Raman instead.