I think there are a handful of hosts that do not care about their guest' experience and instead are mostly focused on the financial gain of renting out their place. That being said, I'm an airbnb host who has rented out my 2nd bedroom in nyc to some of the most amazing individuals I've ever met, and many of them are some of my best friends now.
It really depends on the host. And I think that 90% are fantastic.