I think it's also a matter of expectation. People expecting conscious thinking machines with reasoning abilities are going to be disappointed but that doesn't mean AI as a field is useless and a big hoax. There are plenty of narrow problems where we can benefit from the use of AI. I am an MD and I see a lot of use cases of AI based technology in the future within the medical field though it needs more co-work between AI researchers and medical researchers. Good quality scientific validation of these systems needs to take place and that will take some time.