Who do you think is the worst early game champion?

I wonder what the community thinks is the weakest creature in the early game in Summoner's Rift. Like, we always talk about good bullies and good late game scalings. Recently I've been noticing some late game monsters (Vayne, Nasus, Singed) to be actually a decent threat early game (Singed zones you with poison if you are melee, a Vayne stun early game leads to a heal, a flash or a death very often and a Nasus' sustain can actually be very frustrating to deal with).

EDIT: Should have added Kassadin and Vlad, I definitely agree they deserve a spot here. I should also add that I do not think Yasuo is that bad early, nor Vayne in all honesty, I just put those who I have seen to be frequently complained about. Also, Draven is just sarcasm, it's why I put the smiley there.