I like Airbnb, because it's made staying abroad much cheaper and nicer. I also like being able to rent a taxi on an app in a new town.
For awhile I'd been using AirBnb by reflex, but after a few pretty bad experiences I started indexing it against local hotels before committing, and my experience has been that if you just need a place to be (don't care about kitchen) then AirBnB is not nearly as competitive as it used to be. So yes, AirBnB has made staying places cheaper, but the industry is also catching up. Concrete example is nightly rate for a studio in Paris vs the hotel next to it were +/- euros difference when I was there last year.