My biggest frustration with Adwords is that when you create a new campaign, Google sets ad serving to "optimize" rather than "rotate." This means Google gradual

My biggest frustration with Adwords is that when you create a new campaign, Google sets ad serving to "optimize" rather than "rotate." This means Google gradually shows higher performing ads more often, which would appear to be helpful. But they do it before an ad split-test reaches statistical significance (which screws up proper A/B testing). When you copy an existing campaign to create a new one, they even go so far as to switch that setting from "rotate" to "optimize" on the newly created campaign. And with the Desktop Editor there's no interface to change ad serving settings. I'm sure it's profitable for them to have "optimize" set as the default. I just wish they'd allow users who are knowledgeable to select "rotate" without hassle.