It's not only about the winrate and effectiveness of the card. Tickatus burning half your deck is probably one of the worst experiences a player can have. It's just not fun for the player on the receiving end, and the card just reinforces the rock paper scissors gameplay in standard right now. It should only be able to discard 5 cards in a match.
Rin, the First Disciple is a better designed card IMO.
I agree, I think it is a horrible experience to have it played against. However, I guess you can argue Reno jackson has the same rock paper scissors feel of if you play aggro and they drop reno you loose and you feel like one card should not win the game. I do think Tickacus is a card that could become an issue in the future, but currently I think there are bigger threats in standard that need looking at like ramp paladin.
Rin, the First Disciple Did feel alot less toxic to play against.