I've been turned down by Google after the infamous day of interviews; passed all of them with flying colours except the last one, given by an arrogant kid whose every question seemed like entrapment. Recalling the warnings i got from my HR recruiter in the first minute of the day, i have a feeling she knew what i was in for.
I too had an extremely bad vibe about the campus. The ambiance on the whole premises is the same as school : careless playful youth (even coming from the senior engineers), toys everywhere, and the implicit deal that Google will give you everything if you give it everything. I felt a perverse temptation to give in to this, although i knew very well this attitude generates a dependence relation in the employee.
After working in the austere world of avionics for over 10 years, i found it absolutely shocking. But from their point of view, this is a winning combination. It is just not conductive of hiring senior employees, of which they probably have plenty supply anyway.