Let me start off by saying that this not a post trying to persuade readers to view a certain champion or champions as broken or balanced. Personally I don't care.
What this is trying to say is in light of the many "x" champion is OP threads that have been popping up recently, this is to help newer TT fans know how riot addresses balance in TT .
To date Riot has never made a champion balance change to balance TT.
History shows us that through the old Tryn Era. For those of you who don't know, Tyrn used to be the "Darius" of TT. Never was he nerfed to changed this. It wasn't until Tryn jungle became the ultimate pub stomping tool in SR, did Riot knock him down a peg. And conveniently, for players looking for a quick win, that was around the time Darius came out.
Presently, Riot's Nome has addressed the Darius OP threads saying that they will look at tweaking the altars, nothing mentioned about tweaking Darius himself.
In conclusion, you have 2 options for champion balance in TT.
1) Become an expert at countering whatever champion you hate facing.
2) Find a way to exploit the Champion on SR, and spread the tactic so that it draws the attention of the live team.
Peace be with you and may you bring balance to the force.