Is it too late to change the title to: "City bike shares more often more convenient than using your own bike" --?
No worries, I know what the intent of your post is.
Like I said a few posts above, I can see situations where a bike share program works very well. When something is more convenient than another, it can certainly be called
better.
A bike share program may never replace a bike of your own if you are an avid cyclist and/or love your bike, but I'd say people like that aren't in the majority.
Car sharing programs such as Zipcar and Car2Go are popular in urban areas because they are convenient for the city dwellers. I can't see how the same can't be said about bike share programs.