Defensive Stance Nerf

Read this tooltip: http://ptr.wowhead.com/?spell=71

A defensive combat stance. Decreases damage taken by 10% and damage caused by 10%. Increases threat generated.

Now read this from the patch notes:

Defensive Stance now reduces damage caused by 5%. (Down from 10%)

Combine the two:

A defensive combat stance. Decreases damage taken by 10% and damage caused by 5%. Increases threat generated.

This was a buff, not a nerf.