Google's instant answers are generally pretty good in my opinion, but in situations where the answer really matters, it could cause dangerous situations in the cases where Google does get it wrong. A good example is how Google chose the wrong picture on how to do cable crimping:
I’ve found it pretty unreliable. I was researching Teflon pans the other day, and all the instant answers were myths about how Teflon pans will give you cancer. And when you click no the sites, it’s usually clear if their answer is at all reliable or not. Stuff like that means I always have to do more work with instant answers than if I just ignore it.
My company gets a minimum of six wrong numbers a day from people who got our phone number from Google. Google somehow thinks there are several thousand companies associated with our number.
https://imgur.com/a/H3Uhg
Regarding the example above, Google's answer with a picture looks clear and sounds very authoritative. No further reading seems to be necessary.