The riven nerf didn't do much......
She still destroys you if you are a low mobility top laner
4 Comments
Play a champ that you are very comfortable with, like vladmir, or kennen (Good/better than average mobility). Or just counter her without even trying with 
:3
& 
HAHAHAHAHAHAHA!
has no mobility and can cause Riven players to have nightmares if you have the basic idea on how to use him.
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Darius out trades Riven early game by quite a bit.
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Riven prefers short trades with her Q and W, then backing off with her E. Darius just pulls her back in for more free damage after she E's. Since she has 0 abilities left to fight with.
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Darius has a much better all in at level 6.
In short, Darius does everything that Riven players try to avoid early game. Long trades, heavy harass, and being zoned hard. Darius does all of that if your a squishy melee like Riven is early game.