RIVEN. Balanced or slightly over powered.
I think that Riven is just slightly over powered. I think she's good, but has too much going for her all at once.
She has the high AD ratios, she has the movement speed, shields, stuns, and she has ranged ults that do physical damage.
I think that her ultimate needs to do magic damage when unleashed in a wave. I think this will account for the ratio bonus damage and help nerf her just enough to bring her in line.
Much like how Ashe's ult is based on magic damage.
Otherwise. I think you need to instead nerf her shield or INSTEAD maybe nerf the jump range.
Thoughts?