The "Powerstroke" is known in the industry as the "Powerjoke." The 6.4 is no better. The last good one was the good old IHC motor Ford bought for years. But it doesn't matter because Ford knows its buyers very well. They will continue to buy anything with the name "Ford" on it. Really, they don't care.
From what I have heard, the problem is quality control in the assembly plants, specifically torque specs. GM had the same problem, which led them to source the Duramax from Japan.
Most guys buy diesels so they can be pretend truckers. If you really want to haul and a gas engine fits your needs, go gas on a domestic brand. You can buy a lot of extra fuel for the $9k or so the diesel costs you.