Why necro up an old thread to complain about something irrelevant. Cianna and Shayd have set stun rates, we know this these days. A hit rune means you have less chance to miss, as a missed hit has 0% chance to stun. Same with a blocked attack.

Outside of giving your heroes the best chance to land a hit, stuns always have and always will be luck based on their base % chance. They were never nerfed, people just thought that way.