Once you keep playing, there's no way you wouldn't keep improving. There's no way the guy in the YouTube video got to that level in playing a few times. Keep playing and keep getting better.Unfortunately, my level of playing haven't gotten to that level. If I ever get that good, I will be interested in joining game tournaments and see how I fare in it.
Halo 4 is is one of my favorite release of the Halo games. I did had some impressive play with it but watching this guy play and his level of ruthlessness in the game, he's definitely the best in the whole world.