Wai Wai is probably 4 stars before 9 pm. After that you risk wasting your money if you place an order.
I used to order consistently from Wai Wai and loved their food but stopped after a bad experience. I placed an order at 10:30 on a Friday night. I asked if they were still taking orders and the receptionist cheerfully told me yes. I asked for a large shrimp fried rice and to shrimp egg rolls. I got one large chicken fried rice with very bland chicken in it. I suspect it was boiled for time. The shrimp egg rolls barely had any shrimp in it. My boyfriend is a pescatarian (strictly fish and vegetarian eater) so he couldn't eat anything I got. I really wasn't interested in it either, and as the dinner cost 20 dollars after the tip. I felt like I wasted my money. A friend that also ordered there had a similar experience when she ordered at around 9 pm. Take our advice and don't order anywhere near their closing or you will be disappointed.