Mostly,
it lacks serendipity, writes Ian Leslie. Thus, we are less likely to come across things we're not in search of:
Google can answer almost anything you ask it, but it can’t tell you what you ought to be asking. Ethan Zuckerman, director of the Centre for Civic Media at Massachusetts Institute of Technology and a long-time evangelist for the internet, points out that it doesn’t match the ability of the printed media to bring you information you didn’t know you wanted to know. He calls the front page of a newspaper a “discovery engine”: the lead story tells you something you’re almost certain to be interested in—the imminent collapse of the global economy, or Lady Gaga’s latest choice of outfit—and elsewhere on the page you learn that revolution has broken out in a country of whose existence you were barely aware.
I suppose this is the problem blogs like mine have been created to solve.