Humans are notoriously bad at this. See countless examples of people claiming “hax” when they’re against a player that’s much better than them.
I guess it's the Dunning-Kruger effect, where players think they're a lot better than they really are, so they can't imagine how someone can be _that_ much better than them.
IDK if it's still the same these days, but in BF2, 8 people in a squad all working together and doing their role within the squad could easily roll over 32 randoms on the other team.