I would not hesitate to ride in a Waymo, just haven't gotten around to it yet. There are hundreds of them roaming the streets of Los Angeles as we speak and they are surprisingly good drivers...better than 90% of humans at least. The only thing that seems to hang them up is getting stuck behind a delivery van or other large box they cannot see around that is stopped, other than that they can navigate around the zillions of double parked vehicles everywhere here. They are operating in an actual crowded urban environment here and doing really well.
As a part-time Uber driver, it doesn't help me that they are so popular but I have to give credit where credit is due...they can drive.