There is no Chinese restaurant on Crystal Lake that could even be rated as average. Most of the restaurants/buffets along Rt 14 are generally pretty bad.
The gourmet House, in an old Julie Ann's location is a pretty good white table cloth restaurant. There food is imaginative and pretty reliable.
Gourmet House Corporation
1740 E Algonquin Rd
The Plum Garden also prepares very good American-style Chinese food. Get there pretty early as it is one of the most crowded restaurants in McHenry.
Plum Garden Restaurant
3917 W. Main St.
McHenry, IL 60050
If you are looking for food on the order of Chinatown in Chicago, you are bound to be disappointed.