...Honestly I never even saw a Riven win a game.

Either of the following scenarios happen when a Riven is on my team,

1. She doesn't know how to play the champ.
2. She goes against a heavy cc comp and just dies there.
3. She is fed, but cannot carry.
4. She gets carried by a superfed adc/mid and she is a non-factor.

...How does she have a 53% winrate again? I just don't see any Rivens even winning the game, Either I have bad luck, or Riven just can't win. I'm considering dodging Rivens at this point now.