FORMULAS:
These are just example formulas to show how this system could be effectively calculated. These formulas are not intended to be accurate as I do not have access to the data and so it would be up to the dev team to find the exact values.

Values and thresholds could be differentiated between Jobs if necessary to ensure the ratings fall into the thresholds set out in the "THRESHOLDS" section above.

• DPS: Personal Damage Output + Party Damage Output due to buffs.
• Tanks: Damage Taken + (Damage Mitigated x 1.2 *Gives bonus for effective use of defensive abilities) + Damage Output - Party Damage Taken *Rewards tanks who effectively hold aggro.
• Healers: Total Healing + Damage Mitigated from defensive buffs + Damage Output.

All values would be taken from the totals at the end of the duty. FFXIV already records individual values in the chat log. I am unsure if FFXIV already records values for damage mitigated, and values from buffs.

IMPLEMENTATION:
The system could be implemented so that your rating is shown either after defeating the last boss of the duty or after leaving the instance. Showing the rating after leaving the instance avoids the possibility of any players asking their party members what their rating was further reducing any possibility of harassment.

The system could also show your personal high scores and the date attained for each duty, this could be your top score, top 3, top 5 etc. Depending on the memory requirements for storing high scores on the server. Alternatively the high scores could be saved locally if there is any concern about the data requirements of saving high scores on the server.

The rating screen should clearly show the criteria for your role, and clearly explain that the rating is personal only. (Again this removes any possibility of players being harassed for poor performance. Showing rating criteria will help people to understand what they can do to improve. (Exact formulas don't need to be shown, just something like "Criteria: Total Damage, Total Buffs".))

The system should be disabled by default so that it has no effect on anyone who is not interested in this type of system. It could be enabled via the menu, or better yet, through a side quest unlock. Unlocking through a side quest also gives the added benefit of an opportunity to clearly and thoroughly explain the system to players. Further details and the method for disabling the system can be explained via the active help system.



Thanks for reading. If you have any thoughts, concerns or ideas feel free to leave a reply and share your thoughts. I will update this post based on the discussion.