Riven is a problem. Some possible fixes as well.
Okay, so
shield cooldown should be raised. I've had
escape ignite too many times because of the extremely low cooldown on her shield. Her cast time cancellation is also a problem. She can increase her Attack speed essentially with all her abilities, this cast time cancellation should be nerfed in some way. Her ult gives her way to much damage as well. Some
will auto you twice and throw her projectile and kill you. How is that even remotely fair for a champion with a massive shield, cast time cancellation, and a stun... I just wish riot would do something about her...