Seems to me, as an old, slow rider, that being a "good" rider involves a lot more than how far or how fast you can ride. On large group rides and cross-state tours, you'll see a lot of strong riders who can ride fast, or who take pride in riding "a century every day for a week" who are not good riders. Some of them present a danger to themselves and other riders and give cycling a bad name.
Being a "good" rider means, among other things:
Having and using good technical riding skills,
Taking good care of yourself and your equipment,
Being a safe, defensive rider who respects the rights of other riders and vehicles,
Ride in such a way that engenders respect for cycling among non-cyclists

If you want to become a "good" rider, take a LAB Road 1 course
If you want to become a "really good" rider, take the course to become a league certified instructor...and become one.