I think people often look for contrarian takes. That's not a bad predisposition really, because they often tell me something new--- something like "Why I Love Being A Janitor" might have something interesting in it, while "Being A Janitor Isn't For Me" is basically what I'd expect, so probably wouldn't read it unless it had some particularly unique take on why being a janitor isn't the best job in the world.

That said, this article didn't tell me a whole lot about why Google might not be as great a place as you think, except the stuff I expected (it's a big company, you're not really in control, etc.).