aninhumer pointed out the main flaw in this line of reasoning but it's not just the lack of long term data. Many companies change models frequently or make quiet design changes – e.g. the blender given a good reliability review changes a couple of years in to replace metal gears with plastic, which requires a teardown to see. If you go to Costco, Sam's Club, etc. count how many things have slightly different specs and model numbers than the ones you can find reviews for, etc. The last time we bought a washing machine, only one of the models which Consumer Reports had recommended a little over a year before was still offered for sale in our region – everything else had changed and most online reviews were just “we got it last week and it's great” comments which don't tell you anything about long-term experience.

In some cases, you can simply conclude that an entire brand is either unreliable or trustworthy (e.g. Apple doesn't sell Walmart edition devices which break within 18 months) but in most cases you have to do a lot more research to know what level you're getting.