Well im pretty much spitballing here, but what about adding Dodgeball to the mix of game modes? It is rather fun and silly watching a bunch of pyros being obliterated by a missile going 300mph....
(For anyone who doesnt know what it is, two teams of pyros must airblast player-seeking missiles. Upon doing so, the missile will target a player on the opposing team. Each successful deflect increases the speed of the missile.)
Which is why it wouldn't be the only game mode, im just suggesting to add it to the rotation, if it is possible. Judging by the votes, either people just dislike this game mode, or me.