These four poorly performing tickers are hinting at broader, bigger-picture problems that investors will want to altogether avoid.Generally speaking, when you buy a stock doesn't really matter if it's a good company and you are investing with a long-term mindset. But that doesn't mean it doesn't help your overall returns to buy a stock when it's trading at a discount. Doing so helps you get more bang for your investment buck.However, not all discounted stocks are necessarily worth buying. There's always mor ...