Perhaps the reviewer doesn't understand that this movie is a comedy. it is not meant to be viewed as a martial arts movie. it is rather a parody of many movies including Gangs of New York, Road Runner etc. CGI was used to an extreme only because its a parody.
Whoever gave birth to the ancient art of Kung-Fu could never have imagined that one day it would spawn a torrential genre of cinema with millions of die-hard fans. Kung-Fu Hustle is made from the same mould as the dozens of formulaic martial arts movies that China churns out each year. Now that the Bruce Lees and Jackie Chans have overturned our conventional concept of battle, Stephen Chow gives us his own brand of haiiiiiiii-yah in a movie whose brilliant fight sequences are weighed down neither by philosophy nor gravity. A poor man's Crouching Tiger, if you please.