If you live in Europe, the best Chinese (especially HKnese) cuisine is in Chinatown London!
In most other European countries, Chinese restaurants are usually offering westernized Chinese food.
If you want eat Chinese food with good quality I can recomment you trying them (too many choices) in Hong Kong and Taiwan. In (mainland) China, there are also great and even elite cuisines but many are still not at high standards yet, especially the cheaper ones.
Chinese food has a very big inventory to display, since it contains so many provinces with their own local food. Some of the most famous are Beijing Duck, MaPoTofu from Sichuan, TsaSao and DimSum from Guangdong etc.

The bandwith of the Chinese cuisine is so huge, that you definetly will find things you love and things you hate