Lookit. No city rating tool for bicycling will ever be perfect. And kudos to PeopleForBikes for trying to measure comfort at a network scale!
But #CambMA being scored and ranked this low ought to be an important calibration data point on your methodology.
Lots more work to do here, but this is among the very best bicycling cities in North America. It's not debatable.
@marcprecipice yeah, Arlington VA (where i lived for 10+ years) consistently scores far far too high on this thing. It's barely behind Cambridge (and might have been ranked higher last year IIRC?), but it's not even close in reality.