... so you are saying you were assassinated.. kass, at lv6, w/o CD is 6sec CD on ult, and it takes 3 jumps to move from in bot lane into top.. at that point his mana is hurting.
TT requires awareness and better communication than rift due to the lack of wards. This is critical vs twitch, eve, shaco, and kass, all of whom can be anywhere easily, and Ganks your face off... well maybe not twitch ;P
Another misconception is that kass is the only one to hop that wall, again, as has been said, many characters can do that.
As for lots of cc.. you have no targeted cc save for brand, vi has an ult and a charge up dash, the dash is really only good for initiating or chasing for its cc, ult is on long CD.. so its not a great cc.
Brand has to do some funny stuff to get the stun, and barn just has a silence.. as far as cc goes, u went light. Kass's silence and slow both go down to about 4sec CD, though the slow needs to charge, this plus his ult makes him a brutal assassin... downside is his early game is total ****, so clearly you didn't kill him enough when u had the chance.