you know what, mods are to blame for this for not putting a disclaimer for idiots who can't understand the meaning of ''data quality''.
this shit gets asked like once a week here.
to answer you: IT'S LITERALLY DATA QUALITY, IT HAS NOTHING TO DO WITH HOW YOU PLAY
aka it's the amount of matches parsed by Dotabuff+
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Played some really shitty fun games with my friend, and we lost(ahhhh was fun OD ultying to a chen creep in the enemy base with a random team member) but somehow my data quality went up to B-, even though I did nothing