As for "Japanese" stuff, that's true: there's a bunch of Japanese-branded stuff that's made in China, and it's definitely not of the quality of Japanese-made stuff of yesteryear.
There are also problems with literal counterfeit Japanese products. One example I'm familiar with is Hakko soldering stations; it's apparently not to hard to find Chinese kock-offs who duplicated the case, packaging, and branding but otherwise use a substandard design with substandard components.
However, the people who posted about fakes all seemed to be saying the same thing: they bought it (usually on Ebay) from a seller in China.
Well, what do you expect?
Yes, if you buy something name-brand from a seller in China, who sends it directly to you from China, you can expect it to be a counterfeit.
Also, plenty made in the usa products are of high quality.