It's really funny how Riven isn't even in the Top 10 most banned top lane champions but you people are always complaining about her. She's also only 8th in win rate. No one bans her, but then you want to turn around and complain how "not fun" she is to play against. I don't think the problem is Riven, seems like the problem has something to do with you people. Obviously she doesn't need nerfed if you don't see her as a big enough threat to ban her. There are literally 8 Top lane champions that have over a 20% ban rate, with Yasuo and Aatrox being around 40%.
Oh and if you don't play Top, you shouldn't even talk about champions related to it. There's nothing worse than when I see ADC and Support mains complaining about Top laners. You aren't the ones playing the lane, you don't know how broken or not broken the champion is.