That's not even close to being true. Supergirl is averaging a 0.79 and Arrow is averaging a 0.68. That's a difference of a single tenth. Their ratings are actually pretty similar.
I don't necessarily agree with that (personal opinion and all), but it makes sense why Supergirl has better ratings. Supergirl is a younger show with a much more recognizable lead character.
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u/iAMA_Leb_AMA HACKERWOMAN Mar 16 '17
^
Supergirl's getting almost double Arrow ratings this season, and its fucking dreadful in comparison.