How do you tell what is a good rating on Mylot?

Yes, the figure in the parentheses is your rating. However, it only represents the number of posts that you have made and does not take into account a lot of important factors. Your performance level at Mylot would realistically include the amount of response that your discussions have generated, the quantity of best responses that you have been credited with and the number of + ratings that you have been given. It is therefore quite feasible that a member with a rating of 200 could have contributed more and have been paid more than a member with a rating of 500.