"Just CC him" is as retarded as "just kill him"
CC should not be the only counter to a champion..if thats the case make every skill shot point aand click so that every champion must get CCed in order for it to die,not some champions only like

Dodge,CC,play with their minds

"jUsT cC hIm"

and who secondary role mains a champ with incredible CC 
which normally have decent mobility with a large shield, shecan be easily stopped do to the fact that her shield is tied to her dash... she she cant shield herself while in CC like a root, silence, or grounded
can because almost unstoppable if they are fed and played properly unless u can actually hit them with a form of hard CC, and because they have very low cooldown abilties they can use to dodge most CC throw at them... if if they do actaulyl get hit by a hard CC it is extremly effective at giving you an opportunity to stop them
is laughably useless unless you can constantly refresh it. with something like
and spammable spells or a
or your just playing 
who you can stop from chasing you... he can still do many thing to attack you back even while rooted.. most notably if your a melee champ and an ally rooted him, or you just managed to root him right before he was in AA range
