Matchmaking Ban

I played a few CTF games today and I kept quitting because I was assigned team members that were no good at getting the objective done. I am tired of this occurring and quite frankly I will not spend 15 mins on a game that is a loss b/c your teamates are pretty horrible.

I got matchmaking banned from xbox live. What does this mean? How long does it last. This really is not fair. I may have reached the rank 130 but i do want to work on commendations. If this is really going to start happening then goodby Halo 5.