Ghostcrawler explained the internal concerns about Dispel Resistance mechanics from talent trees and dispel abilities.  The Developers wish to hear your feedback at the following forum thread. Feel free to submit to them your feedback, and tell us what you think by posting a comment below. Do classes need this nerf, or does it sound logical to you?

Blizzard Quote:
Ghostcrawler: The general rule of thumb is that helpful spells (e.g. buffs) and dots are protected. Other offensive spells (e.g. crowd controls) are not.

We are definitely interested on hearing feedback on this implementation. We like the basic mechanic of casting and dispelling spells, but I think many players agreed that the system beyond that needed an overhaul. I am sure many players have their own ideas on how this should have worked, because a lot of them have been pitched to us.

Feel free to discuss dispel and dispel resistance here rather than having the conversation across multiple threads.

The dispells spells themselves generally have not changed. The talents that protected some of your spells have changed.

Overall, dispelling attacks used against you should be easier to dispel (except for dots).