Well, at least you're calling it what it is.....a tournament and not a playoff. A playoff typically has teams that met agreed-to, objective criteria, whereas a tournament is simply an invitational that is looking more and more like a beauty contest.
Every other league in every other sport uses divisions to determine who gets the right to play in their playoffs. MLB, NFL, NBA, etc, etc. How many years (before the wildcard anyway), did the Yankees or Red Sox get left out of the playoffs even though they were often times better than the Royals/Tigers/Indians in the Central? Or how often have teams in the NFL been left out with better records? It happens. But again, if there are agreed-to, objective criteria, then no one can complain.