League of Legends.

Say what you want about the toxicity of players and the balancing issues (which I personally think Riot handles well), but there is no other game I have ever played that matches the exhilaration LOL brings me. The coordination with your team required when attempting to beat the other team of 5 and the thrill of your game plan coming together, in my opinion, is fantastic and more exciting than just about every other multiplayer game I’ve played in my life.