This is still a new thing. Google warns there may be dangerous roads on the bike routes, not to mention unmapped bikeways. And of course, the most direct bike route isn't always the most interesting bike route, even if it may be the safest.
The ailing BikeMetro offered more, at least for Los Angeles, because it let you factor in your tolerance for hills and traffic.
But if you're looking for a basic bike ride from point A to point B, especially in an urban environment with a lot of traffic, this is a good way to start and you can do your own "research" and exploration on the pavement.
Thank you, Google!