Assassin or...
Burst dueler? Assassins are supposed to be weak to fighters/tanks that properly build against them. But with lifesteal/CDR and of course DD they can fight long enough to rotate their combo 3 or 4 times in 1 fight and destroy tanks through lifesteal and CDR/lifesteal with DD neglecting the burst that should have killed them.
When you have a Riven/Yasuo/Tryndamere/Lee Sin etc that can trade with Wukong/Malphite/Darius/Renekton late game... that's an issue.