I think you'll find a lot of the branded goods you've bought over the last 10-15 years will have been made in china, quite a few companies outsourced thier manufacturing to them because of cost (they made more in thier margins by doing this and also saved on having to buy in the tooling). So .... now the chinese have these designs they make and sell them for a fraction of the cost, but yes I will agree that quality control is dodgy at best (so there are a few sellers out there with low grade stuff) there are however quite a few reputable suppliers and their goods seem good quality.
Its like anything ....... you make up your own mind what you're prepared to accept!! I know of a chap that bought an OEM Aprilia brake lever (new lever!) for his Mille Challenge bike and the thing snapped coming into paddock hill at brands (his bike was written off!! so no matter who it is ..... like 2stoke says there are always failiures