A "good" anarchist would be one that attempts to practice their views. Their theory of action would directly correspond with their actual activity while attempting to create proposals to encourage others to participate in the direction they are working towards.
A "good" anarchist also attempts to avoid slanting others views with logical fallacies when critiquing other ways to practice anarchy. This honesty can more easily show what people actually think and why they agree or disagree as well as expose the depth of the agreement or disagreement.