Just ate there with some buddies.
Really good lunch menu with LOTS of interesting options priced from $6-8 on the lunch menu: spicy fish filet, shredded pork with bamboo shoot, water spinach with cellophane noodles, shredded beef with chiles and a few others I can't remember.
Portion sizes were surprisingly large.
Hot and sour soup was not really noteworthy.
For bargain authentic Chinese lunch, I would put this as good as any, up there with Shangri-La which is always a fav, but of their lunch dishes, only 5-6 are really the good stuff, whereas Mulan Waltham has at least a dozen tasty, well-executed options.