I decided to publish my guide for Riven as i played her for last few days and i had nice scores.

I am not gonna write how to play her, 'cause my way does not really differ from the ones in other guides. I will just place some short explanation for my choices. Generally speaking I focused on maxing her pros and minimising her cons, which is a great way to make i good build for a champion.

When picking runes i started to minimising Riven's cons: she is very dependent on her cool-downs. That's why i took which i prefer from flat If u want u can also take these, but i like to make my champions more... late-game-roxing ;)
Riven is also a bit squishy early game so i picked some armor with
For more DMG early i chose Greater Mark of Desolation They give a nice amount of armor penetration, which really procs early game.
Finally i took 3x for more mobility- a great Riven's advantage.

Choosing masteries was quite obvious: 22/0/8 for max DMG output. If u like more survivability early, You can take and instead of Utility.

Skill priority:
Blade of the Exile > Ki Burst > Broken Wings > Valor
Maxing Ki Burst earlier from Broken Wings gives u more DMG and also shorter cool-down.

Please try the build and let me know if it works for You, what it lacks an so on :)