The problem is many worst purchases may be a result of a system mismatch of some sort, and is no reflection of the quality of the product itself
In my opinion is a mismatch a problem with technical datas, for example the output of a Preamp does not match with the input of the connected amp.
A total different story is the quality of Tone for example or speed problems with a turntable. Here you can find indeed a lot of units which accelerate depression.
But at the end of day, there is a Fangroup for everything and a thread like this one is interesting.