The only thing that changed is if your have grim sac.....25% less burst, 25% dmg dot. The main downside is that the dots dont stack so you should be chain casting it without putting something in the middle.
While there are things I would like to see changed I have yet to feel real impact from the last patch to the negative. The other things that were added are super helpful, especially with ember generation.
The nerf itself was due to pvp. If there is a problem with the class or spec its not CB. The other spells frankly need to be better well rounded.