All marketing is inherently untrustworthy by virtue of conflict of interest. The people trying to sell products have every incentive to lie and mislead potential consumers. At best you get language that emphasizes upsides while downplaying downsides.
There's a reason people search forums like reddit when they need real product reviews: marketing simply cannot be trusted.
> Without marketing how the heck would you ever learn about or even find potentially useful products?
Word of mouth.