Heres one thing I think they could to to TF ulti to make a little less QQ for that(even though I think he isnt OP at all). Change it to only be able to teleport within oh say 1500 of an enemy(so you can out of line of sight), BUT make his ulti not let the enemy know you see them. Banshee's can still block it so a smart team could say wtf my banshees is gone, care TF ulti!! This could make him into an assassin. He can tele in but only near enemies, can see enemies to orchestrate ganks for his team, can pick off a jungler or straggler, but cant teleport into your base when all 5 of you are at his base due to range.
sorry for grammar, typing while attempting to work.