Well, in a way the nerfs are indeed nerfs. Do remember that before the E nerf, she had a slightly higher winrate between 55-56% and a play rate of around 16%, now her win rate is around 53-54% with the play rate around 10-11%, and considering Riven is mostly (I said mostly, not exclusively) played by mains, losing both win rate and play rate does show it was indeed a big nerf, as if it was just placebo, due to the compensation buff and loss of play rate, her win rate should've went higher than pre nerf, not lower.
So all in all, it was a big nerf, but thanks to the bull
item called Spear of Shojin, she is still too strong. Remove spear and much of her problem is fixed, if not completely.