Sheesh, Tim... why so angry?
Much of what you say makes sense, but I'd moderate it slightly...
From back when I bought mine, my research revealed that the Sinotec wasn't nearly as horrid as brand-sluts loved to claim. The panels where the same as found in many branded sets (if I recall, one of the bigger global producers of LCD panels was a shareholder), the scaling engine was a Faroudja - regarded as the best in the business back then, the construction was subjectively better than many LGs and Samsungs with comparable features, and I had every conceivable type of input available - multiple instances of some. And, most importantly, it cost a fraction of any other 42" set back then.
The single time the TV acted up, their after-sales service was also exemplary.
I don't think I'd buy a Sinotec today - better products can be had for not much more money - but they certainly made it possible for me to get a biiiiiiiiiiiig screen television years before I'd otherwise have been able to. As an aside, they're branded Sinotec here because Prima Toys came a few decades before.Of the 'budget' brands, it's probably still the best option - 'budget' just isn't such a huge consideration any more.
The anger comes from experience. Some friends of mine bought Sinotecs without thinking and now really regret their decision, they all regret not having spent a little more and having wasted their money (and these are their words).
Sure, its one of the better budget brands and for a guesthouse or shop the TVs are well sufficient but that's where it ends.