1.) Make tags more visible. I rarely get a chance to check them before a match. 2.) Mandatory tags for quitters. If you quit early, you should get stuck with a tag that indicates that you are more likely to leave mid-match. This could fall off after completing a set number of consecutive games.
I wish they explained on the screen that shows your unlocks for the match what they were, for quick reference between matches. Quitter tags would be okay with me, long as they were for a series of dropouts instead of one or two.