I’ve read the same or similar, but it always seemed to boil down to the motor being underpowered and the packaging knocking parts loose in transit.
And, as with almost every fecking thing nowadays, there’s a very vocal minority who tend not to reflect the general concensus.
That said, the A4 in that eBay listing looked and sounded perfect, and my own has no issues.
Maybe “rubbishing” is a strong word, but when we already have A/S floating the concept and estimated price point, it doesn’t seem too far-fetched: