Came here with my family and we generally found the food under-flavoured.
I ordered the noodles with spicy cumin lamb sauce (not the stir fried version). It was not spicy at all nor flavourful enough. I guess it's great for people who are looking for more subtlety in their food, but I think what makes this type of Chinese cuisine great is the abundance of spices.
Some positives:
1) portion sizes were very generous, even for a small serving of noodles (could've been shared between two people!)
2) my dad had the #1 (Langzhou soup noodle, I believe it was) and the broth was clear and tasty
3) the cumin lamb skewers were delicious and not too fatty
I would stay away from the noodles with sauce, and the stir fried noodles. The soup noodles were decent though!