It's challenging to beat the stock market. Many people use the S&P 500 index as a proxy, and there are many low-cost mutual funds and exchange-traded funds that replicate the index's performance. When looking at stocks, it's important to compare your potential return with a benchmark since you could easily invest your money passively. Turning to the consumer sector, Six Flags Entertainment (NYSE: FUN) has struggled, and that's reflected in its stock price. Does this represent a value opportunity that's p ...