So if this is such a team oriented game, how come there are no leagues for it? 
My friend and I were discussing this, and we came down to the conclusion that this game isn’t marketed for leagues, it is aimed towards the younger audience because of the cartoony graphics. Most leagues have players that are around 20+, while TF2 is meant for 14+.
It’d be nice to have leagues for TF2 though, because it’s so team-oriented, you can’t solo at all.