> The Better Ads Methodology has not yet tested video ads that appear before (“pre-roll”) or during (“mid-roll”) video content

Funny that they would have a special rule for this kind of ads, that's exactly what Youtube does ... (Except that for me it usually is completely irrelevant, like ads for cosmetics or video games in the middle of a chemistry video.) I'm not expecting them to include this type of ads in the methodology any time soon except to find that they are totally fine.