Assasins
I think there is a big problems with assassins and having the mobility to 2 shot people and get out before anything happens. Now the people that say if they fall behind oh its GG. That is bull crap, 1-2 kills and your back to 2 shorting adc's. The fact is Most assassins have REALLY GOOD Mobility while supports for the most part have Skill shot peels. You can build a defensive Magic resist item but what happens is you lose A lot of damage and that can be a difference in a team fight. If a enemies assassin is fed its GG, they are hard to CC and can pretty much 1 shot the adc or the apc. assassins have ruined Mid champs more then anything else. I really hope that assassins are the next rework.