If I remember well, when Tsu slinged every game, it was because they were versus superior teams, like L_Clan, Bsk, etc, and they failed anywhere, but in some games this added some drama.In some maps watching the Sling fest is boring as hell, but banning sling you take away any possible surprise in the brackets, because sling is the most powerful strategy that an inferior team can get in order to beat a top team. Maybe not allowing double Sling would be enough.