In my experience, hosts have been about half very cool and friendly and half professional, but minimal. My guess is that the people with extremely negative experiences either didn't look at reviews before booking and/or are the type that trash hotel rooms and have issues with spending 2 minutes cleaning up after themselves. Ask anyone that's worked in hospitality: that type of person is sadly very common.
That being said i had an excellent experience in Switzerland. My host went off Airbnb soon after that and launched her own website.
It's not that everyone else, or you, are necessarily wrong about which is cheaper. I suspect you just plan your trips differently or with a different timeline than other commentors.