Strong Offense.
Strong Defense
Strong mobility
Strong executioner.
Strong waveclear
what doesnt rivens kitlet her do? she is like the Thresh of the toplane.
she doesnt master any of these things. but does pretty damn well with them.
and lets not forget, one of the only champions with 2 hard CC that isnt her ult.
ShinkoMinori1 votesRiven is weak if she didn't get fed early game.
Caytheles1 votesif she gets 1 kill its gg.
ShinkoMinori1 votesif she gets 1 kill its gg.
Normally the first one who gets a kill its gg. Unless you get help from jungle its a lost lane if the skills are equal
Serevas1 votesThere's so many champions that you can play into Riven and completely stomp her into the ground to the point she's irrelevant the whole game.
Here's a list of champions you can easily beat Riven with, using pretty much minimal effort. 
All of them are easy to play, all of them beat Riven pretty handily.