How Marissa Mayer Almost Killed AdSense (and she names Paul Buchheit as the real AdSense inventor)
blogoscoped.com
blogoscoped.com
Back in the 19th century, there were people who thought telephony was a lousy idea.
Things will always be like this.
She's obviously open to reviewing her decisions and opinions, and that's more than most people are able to do. I think your criticism is a little undeserved based on this article.
Also, I doubt I'm "too young" to remember much about google, since I remember when it didn't exist.