Star ratings, reviews and completion rates are a good guide on a member's performance history on Airtasker.
Star rating and reviews: The star rating is a score out of 5, calculated as an average of all the reviews and stars that a member has received from past tasks.
Completion rate: This is an indicator of reliability and shows the percentage of tasks that a member has completed compared to all the tasks they were assigned. Only the cancellations that were caused by the member will effect their rate. The completion rate is only show after the member has been assigned to 5 Tasks or more.
Look at the star rating, completion rate and reviews of an another member before working with them. This way you can have a good idea of what to expect when you're posting and working on tasks.