Like most branded merchandise, "gun company knives" are very dependent on who actually makes them:
AVOID: Smith & Wesson knives, including the M&P ones, have been made by Taylor Cutlery (which includes the Shrade, Uncle Henry, Old Timer, and Imperial brands) for a long time, and S&W actually bought them out in 2016. The feedback on their S&W and Schrade lines is generally poor to mediocre, with Schrade occasionally producing some decent budget fixed blades. Remington-branded knives have been made by Bear & Sons exclusively since 2015. As I mentioned earlier in the thread, B&S has had some issues with providing the steel they advertise (I doubt this affects the $10 Remington folders too much).
OKAY: The Ruger line by CRKT is acceptable for the budget end of the spectrum (the now-discontinued LCK was actually very well regarded among budget knives). The H&K line, made by Hogue, as well as Hogue's own stuff, is as good as anything any other American-made mainstream production company puts out. Hogue has also made stuff for Wilson Tactical, which is an arm of Wilson Combat.
IT DEPENDS: Browning has a bunch of manufacturers that make their knives, so quality varies by model. They have a bunch of cheap knives made by nameless Chinese companies that are pretty garbage. They have used Buck, TOPS, and Mcusta, who make good knives.