https://www.dashboard-light.com/reports/Full-size_Truck.htmlThis is an opt-in survey, so it's not indicative of true distributions. That being said, only the Toyota is "perfectly" reliably. The GM trucks are near the top of the pack though, so it's probably inaccurate to make claims that it does not have good reliability. (The "reputation" could be a whole other thing, but we care more about facts than gossip here.)
https://pickuptrucktalk.com/2020/07/is-the-2014-2018-chevy-silverado-1500-reliable-one-year-to-avoid/The charts on here have no y-axis which greatly diminishes their utility, but it does indicate that 2017 was a particularly bad year for transmissions. The 2018 tops the charts on initial (build) quality. Consumer Reports does not rate the 2014-2018 very well.
Except for 2014, Silverado consistently ranks 8 out of 12 in reliability among pickup trucks.
I suspect this resource is text generated by Machine Learning tools, which aggregate information that is publicly available across the internet:
https://www.vehiclehistory.com/articles/chevrolet-silverado-1500-pickup-truck-reliability-how-long-will-it-lastMy TakeThe GM full-sized pickup trucks combine to represent the single best selling vehicle in the U.S. (e.g. the Silverado + Sierra sales > F-150 sales.) As such, their popularity tells you two things. One is that they can't be completely horrible. Yes, brand loyalty is very strong (for some reason) but if they were complete SHIT they wouldn't keep selling so well. Two is that there are A LOT OF THEM on the road, and ultimately the most popular of anything is going to have bad apples, which means you'll have heard of
someone that had a bad experience with one. Can you infer from those anecdotes that the vehicles are bad? Probably not. The one person I knew that had a Tundra had major electrical and braking issues by the time the truck hit 30,000 miles. But from what I gather online, most Tundras are very reliable. I'm going to stick to the statistics on this one.
My uncle and cousins drive nothing but Fords. Some good, some bad. My dad has owned quite a few GM pickup trucks. The worst issue I've seen was his engine losing power around 150,000 miles. This was a 1986 with a 6-cylinder engine. Apparently they have a reputation for the "lobes wearing down." His 2017 (I believe) didn't have any transmission issues, but the wiring in his driver side door has had issues making it hard to use the power windows. (This was my dad's FIRST vehicle with power windows, and boy does he not like them!) Of course, given my dad's brand loyalty, I can't ignore my own biases. Otherwise I probably wouldn't research and comment on GM vehicles at all! But I do think you have to try to find a balanced approach to these things.