I am not a big friend of Disney, but if you are looking for a place to visit during your trip to Hong Kong and you have never been to any of the Disneyland, why not give it a try?
From the perspective of the size of the park, Hong Kong's Disneyland is of course it is not the best one, or even the worst one. That also sets a limit to the variety of facilities as not much fancy big architect can be built.
However, Disneyland in Hong Kong is more like a dip to taste the atmosphere of your childhood dreamland. You can easily fill yourself up in the tiny park with the kind characters. You may find it satisfactory that you can visit most of the popular characters and scenes in just one day.
Of course, Hong Kong is more to explore. Find your way to enjoy the city!