e. g. in this video, Owen Cook (from Real Social Dynamics) who is short, balding, ginger and over 40 shows the difference in the receptivity from random women he approaches in the street when he has a pessimistic/self-deprecating attitude, compared to when he is full of optimism and positivity. when he approaches confidently with a natural energy level, he is able to get random make outs on the street, and ends up taking two girls home with him. this is in spite of his absentee good looks (although he has a nice smile and attractive facial features).
of course, there is the possibility that this is all staged, but I would be interested to hear from GaG.
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Looks obviously do matter, but there's no point in worrying about them if you don't have them or are incapable of having them.
For example, the Zulu in the Anglo-Zulu War most certainly realized that the would be better off is they had repeating rifles and machine guns; but they didn't have access to those, and they had no efficient way of getting them, so they turned to what they had: spears, maces, bows, and sword-like weapons. But, utilizing their other advantages, the managed to still strike a victory against the British in the Battle of Isandlwana of 1879, slaughtering over 1,300 British soldiers.
The point is that even if something like looks do matter, you can still strike a decisive victory through other means.1