As heavily opposed as I am to parsers, I think a rank system is a far better idea since it can be tweaked from job to job, it can be altered based on role performance, and devs can keep the data hidden while still being able to provide tips for each role or job to get higher ranks for content.

I would also wager that unless there's some sort of modification to SSS that includes simplified versions of mechanics, this is probably the closest we'd get from SE for any means of gauging performance.