Problem is, if we are a minority of folks thinking this way, it won't make sense financially for manufacturers. What's happening with the buy-and-dispose generation is that nobody really cares about quality anymore - which is why the market is going in this way.
These days it is problematic to even know what products one should be buying because the quality of more brands than not is bad and many of these were well-designed products in the past that come from trusted name companies.
The manufacturer warranty is just as likely to be a financial product as it is to reflect product quality.
Manufacturers' warranties are only so useful; a lot of companies make you jump through hoops to actually make use of them. If the product isn't that expensive, you'll end up paying so much in shipping that it just isn't worth bothering with when you can go buy a new one. And you always take the chance that they'll simply deny your claim and then your recourse is to sue them (not worth it for anything under a few thousand dollars) and to post bad reviews.
If a product has 70% negative reviews, of which 90% are operator error, I'll probably still prefer that product to the one with only 30% negative reviews where only 30% are operator error.
On the other hand, positive reviews are frequently either lies or fluff, so you're exactly right to weight them much less. A lot of them look like they're written by shills, some of them even clearly say they got the product for free or cheap in exchange for a review, and many are written shortly after acquiring the product so they really haven't had enough time to fairly test it and see if it's reliable long-term.
Also, well-written negative reviews will go into great detail explaining exactly why the product is crap, so look for those. I'm remembering a great (and long) review I read for an automatic cat litterbox which attaches to a toilet here, and sometimes ends up cooking cat turds...