More importantly, being able to put Google on your resume is a strong signaling mechanism , and the concentration of wicked intelligent, inquisitive people of your age is hard to beat.
The fact that you chose Google in favor of a number of legitimate startups signals that you are more interested in stuffing your resume than doing something actually interesting, challenging, and impactful.
I think the days of Google being the employer of choice for "wicked intelligent" people are long gone. Personally I'd rather hang out in a room of random startup employees (some of whom are probably ex-Googlers) than one full of present day Googlers.