The stock market sometimes punishes both deserving and undeserving companies during periods of uncertainty, creating buying opportunities for long-term investors willing to sift through the beaten-down stocks to find the high-quality companies that have been oversold.Year to date, shares of financial data and ratings specialist Moody's (MCO 3.01%) and swimming pool supplier Pool Corp (POOL 0.98%) are down sharply, falling 16% and 11%, respectively. But a closer look at the fundamentals of both businesses su ...