I'm not too sure about worst to date, but Malphite will make your bed rock.
Maybe Morganna? Who wants to date an emo chick?
Uh, Eve's is pretty good. She can use it to take down towers fast, quickly move around in stealth and it heals her for every kill you make or assist in.
Veigar's is very situational. **** damage against manaless targets, only useful vs high mana champs, single target, long cooldown.
Edit : How could I forget Heimerdinger. He wins this hands down.
Chaos the mirror
Takes forever to cast and land (and even harder to actually land and do GOOD dmg to someone) and just ends up getting you killed.
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