Is Coke underappreciated?

I don't know the answer to that question. All I know is that the stock has done nothing for Berkshire Hathaway or any other investor over the last ten years. Yet its sales and earnings are up. Without question Pepsi has done better, in both terms of earnings and stock performance. But does that mean Coke should actually be down for the decade? Might this be a case of undue pessimism? Coke still is the strongest brand in the world...