Having a good process is only part of the equation. A good Scrum Master will champion and enforce that process, protect the team, encourage collaboration, highlight (escalate when necessary) and encourage the removal of obstacles, facilitate discussions, provide fair and constructive feedback, cultivate a culture of continuous improvement and learning, and work to help the team live the Agile values.
Remember that the Scrum Master has authority over the process but not over the team. As the process champion the Scrum Master may sometimes even find themselves in a conflict between maintaining the Scrum rules and guiding the team as they discover the need to adapt practices to better align with their own needs and ways of working. In that regard a Scrum Master should understand and embrace the servant leader role. In the end, a Scrum Master needs to be the person that helps the team make decisions, but not the person that makes decisions for them. (By Senior Agile Coach Jerry Doucett)