A lot of classes are pretty upset about some of the changes we've seen in beta build 8926. Shamans are dot shocking (what else is new), I'm complaining about Holy Priests (ditto), etc. In short, there were a lot of nerfs. Ghostcrawler has emerged to let us know that indeed, there were a lot of nerfs, and there's a reason for it: talents have a budget.
You may be familiar with itemization budgets. Basically, an item of a particular item level has a certain amount of "points" to spend on various stats; if you want to load an item up with Stam, it's not going to have as much to spend on Agi, for instance. This is also the reason why caster weapons have low DPS, because they borrow points from weapon DPS to spend on stats like spell power.