Most savvy people I know managing search for a living would but run something Google put together without quite a few changes.
Some of this comes from lack of understanding the business as well as someone on an account or in house, some is lack of experience since you often can have people barely out of school working on this stuff. Even when I had veteran teams there were still tweaks needed.
Things like keywords that didn't make sense, poor targeting settings, etc. were not uncommon. I know they've made big efforts to improve here, but they still have a long way to go.