Yes, but brands you are talking about are reputed (albeit Chinese) and well known for quality.
Chinese are making everything today, they are making huge quantities and that`s why they are cheaper. Quality of Chinese products is always questionable. I bought many times some Chinese junk, and many times I said I will never buy nothing Chinese again, but I still make mistakes, it`s what I can afford. I just have one rule, don`t give too much money for something Chinese, and if it stops working after sometime just throw it away and buy another.
The Chinese are able to do high quality stuff for themselves. Just look at their highway network... or the massive infrastructural wonders they've built lately...