As with most things in the industry… in the beginning there was street fighter
The #1 will always be Evo moment 37. Demonstrations of God-tier skill in competitive environments is exciting to people, always has been and always will be. I can't even think of a comparable moment in a single player game, the closest thing I can think of is autists doing things like speed runs or long combo videos - they inspire much less than they sort of make you wonder how someone can spend so much time on such a thing.