On a client's new campaign the ads were set to "Optimize for clicks: Show ads expected to provide more clicks".... the campaign is a day old... How do you presume to know, Google??
So I changed the setting to Rotate Indefinitely and make a mental note to actually prepare that basic checklist of default settings I need to remember to change.... on every campaign I set up. EVER!
And this got me thinking - there are some default - out of the box - settings that simply go against Google's own best practices.