In control vs control matchup you usually want to beat your opponent with value. Yet since Warlock's class cards sucked for like last 3 years, you could not outvalue anyone. Now though... in fact, you still can't! The trick is that Tickatus allows you to destroy enemy's value, giving you an advantage in this wicked way (I'm not even kidding).
Is it unfun to play against? Yes, but blame Blizzard for not being able to make Control Warlock viable without such BS card. At this point nerfing Tickatus in any way means to kill Control Warlock as well.