Rocket league is the game that should be most representative of eSports. I've played many games, but what Rocket League offers is truly unique, and it's one of those game which is VERY easy to understand but VERY difficult to master.

The skill progression that you get is real, and it is very rewarding to climb up in the rank ladder.

The servers work well 99% of the time, matchmaking is very quick, it has enough servers to have <100 ping internationally, and even though I am positive that this game will grow, even if it doesn't, it only requires 1-5 players to start a match, which is really great.

Trading system is also very robust, and its a good market with a stable economy.

I really can't recommend it enough, I think that every gamer should at least try it for once.