If you want to make your multiplayer shooter more accessible no matter how complicated the movement and weapon system becomes there's one metric that makes the most newb of the newbs feel productive... simply lower the TTK. As long as player A can see player B sooner once and a while they'll win the shoot out.

Then there's an alternative to this concept. High TTKs with tons of rewards, medals, skins and micro strategic decisions made over a long period.

These are two approaches to making a high skill ceiling SPORT accessible to people sitting on their couches.

Imagine if Tennis went from a group of highly skilled players to something millions of people played from their couch...