I agree that wrestling in general is more effective than Judo for MMA, but for Chael to say that it is useless is kind of funny considering an Olympic Judoka (Rousey) beat an Olympic wrestler (McMann). Also, Karo Parisyan used to throw people around and a large part of Sambo and BJJ guys' takedowns is based on Judo (good examples are Fedor and Demian Maia).
Also, Judo used to have a decent amount of submissions and ground/position fighting before they ruined the sport by changing the rules. Chael showing some hate here to the sport of Judo..