Quote Originally Posted by KalinOrthos View Post
Congratulations, you've just created power creep, where classes are overtuned for content.
Its the launch of an expansion. The odds of all classes being balanced is pretty poor. So, what you do is, you plan for the future. Introduce the buffs needed to bring the classes to the same levels of performance or close enough that they can compete with one another. Sacrifice the balance of existing content. Then, for the first major patch, 4.1, you tune the new content around the now balanced classes.

Very simple process.