Mazda Engine Parts.com

The answer to the title question really depends on the reader and the writer of the Japanese vehicle review.  The review would have been made by an expert or by someone who simply doesn’t know a lot about cars or Japanese vehicles in general.  Reviews tend to be opinions, so as a consumer you should always read the review with an open mind unless the review has enough information added to it that proves what the reviewer is saying is correct.  Information backing up the review from someone like the manufacturer of the Japanese vehicle is invaluable when you are trying to make a decision about a car you like.
There are some people out there that are knowledgeable about a certain brand or the inner workings of a Japanese vehicle.  If you can verify that the reviewer is credible and knows what they are talking about, then you can almost completely trust what they have to say.  Everyone is going to try and be an expert when it comes to cars and what they like as compared to what they do not like.  This is why Japanese vehicle reviews should be used not as the truth, but as an opinion and nothing more.