I make an excel sheet with headings of "Elite", "Great", "Very Good" and "Good" (I don't really consider anything to be outright "bad" on these sets).
I just slot matches in as I go. Elite is something I feel can compete for the top spot. Great is the matches I love, but are just below that level. Very Good is something I enjoyed, but don't see ranking too high. Good is really the bottom-rung stuff.
It ain't scientific, but it works for me.