Originally Posted by Xeroxable
I have several:
Vayne - They always do terribly and blame the team for it.
Kat - On your team? 0/7. On the enemy team? 20/3.
Teemo - Teemo.
Blitzcrank - See that Kog'Maw standing in front of the minions? JK, I'm going to grab Taric instead.
Heimerdinger - He's just plain useless.
As a player of a few of these champs, my 2 cents.
Vayne-I almost want to tell some folks who don't traditionally play a ranged ADC to start with Vayne first if they really REALLY want to try ADC and get good. If they are willing to muscle through the learning curve and tough games. Sometimes coming from the safer ADCs people will seem to take that mentality into playing a Vayne and not play as cautiously and with an eye for positioning as they should. With the end result being what you describe.
Teemo-I honestly am boggled any time I see a bad Teemo. Usually it comes down to poor(or even in some cases) a lack of use of his shrooms. With the slightly less likely thing being not appreciating how squishy he is.