I never said TF2 was confusing, so much as I was saying that fighting games are instant in understanding them at the core, which is sort of their major thing
you might not immediately understand how a MOBA works (not so much that it's confusing, mind, simply enough that you won't figure it out within seconds), but super smash bros is "people hit each other, one of them hits really hard and the other person makes an explosion effect outside of the camera, they lost a life", and that's really easy for someone who never plays any game seriously before to understand.
it sounds like nothing--and from a player's standpoint, it basically is nothing--but it makes the stigma really easy to bypass once you get someone to watch a full match, since they quickly get into it