The headline is that the prediction was overestimating three times in the past three years. So what?
Google's Flu Trend plots don't have uncertainties on them, so they'll never be exactly right. So they either have to be overestimates or underestimates. In any three years, you are going to get at least *two* under or over estimates. So post-hoc, saying "ZOMG! There's three overestimates in three years!! #EPICFAIL LOL!" isn't very meaningful.
Until Big Data People understand statistical uncertainty and are happy to put prediction confidence intervals on their data, this will keep happening. However, prediction confidence intervals are an admission of uncertainty, and uncertainty is weakness, right? And we won't have any of that in our corporate Big Data strategy document. Mr Statistician, you're fired, we're hiring some more Big Data Scientists.