Stop loss orders are absolutely essential to trading. It's just a simple universal truth that cannot be argued against effectively. The ability to place stops correctly is an art however. Most are unable to do this and therefore say that stop losses are no good. Investing however is a different matter and those using a Kramer Frutes type of strategy will find themselves down in a big way until markets turn in their direction unless they are employing wide diversification and thus losses are small that way.