I don't buy Yao Ming as a Hall of Famer. His career was minimized by injuries and statistically he just doesn't measure up. I have a feeling he was voted in only to goose up the ratings for the induction ceremony in China and sell more Yao merchandise there.
The Basketball Hall of Fame covers all aspects of the game, not just the NBA. It covers college and all pro leagues, male & female, foeign & domestic. You may be partially right about Yao, but his total career earned him a place in the Hall, IMHO.