Though yes I admit there are times at which the performance of certain Chinese players alters conveniently to bring benefit to the national squad, there is no large scale problem.
Saina is a loser to say such a thing, and I am an Indian for what it's worth. The way these people talk about Chinese players seems to me to be heavily prejudiced at best, or racist at worst.
Also the way you are talking it appears that there is some systemic problem in badminton. As far as my observation goes, I haven't seen any systemic abuses or "cheatings" in world badminton. And the international federation has already done much for it. The only case in Olympics was charged with a disqualification in London Olympics. The player who were removed were clear-cut favorites of winning the Gold.
The participation in Olympics has been limited to 2 players per country, which in essence means gifting the bronze medal.
Also you sound as if it is "cheating" that has made a Lin Dan or a Li Xuerui or a Wang Yihan or Chen Long etc. I am sorry to inform you that they are truly great players.
Also from the language of Saina it is pretty clear that she is not accusing of Chinese players of cheating or something, She wants their participation cut so that others get more "opportunity" to play. Well, why not we just remove Chinese players all together? This is ludicrous.
Do you have any stats to prove your allegation of Cheating in China Masters? Remember, all superseries are conducted and under direct supervision of BWF. Also as far as I know, the refree and the umpires almost always are of a neutral country, with line judges of different countries from the semifinal onwards. And I have been following badminton for some time now atleast since London Olympics, and I have seen the matches of China Masters which Saina was talking about, and to me there seemed no anomaly.
The real reason to me seems to be that people are generally overwhelmed at China Masters because it is a home event for the nation, they have many players represented there and they take it seriously. That intimidates everyone and people construe even minor things as systemic biases.
you call it games man ship or cheating or whatever, words do not defy logic. .what is evident is being said. Enough said. .something needs to be done now, ps: by the governing body.