If you need to sell immediately in a fast moving market, the only way to be sure of selling is to use a market order. I've seen stocks go down so quickly that by the time you've entered a price, it's already too late. The same goes in the opposite direction sometimes.
One needs to be judicious in their use but a market order is the only sure way to get a fill.
Good DD IS NOT just reciting the PRs and company handouts and looking for the good. Those things are never hard to find.
Good DD IS finding out what the company and CEO do NOT want you to know.