I know way more guys with good luck than bad then. I just had 25 cases of gallon jugs of oil delivered today to my place by the Oil Guy. He had 550 with a lift gate stake bed. I asked him about the 6.0L in his and he told me they had 3 that have been very good to them. I went though enough troubles on a 05 Dmax to know what a bad diesel is all about. Injectors, glow plugs, overheating issues, bad paint, rattles in the interior panels, leaking seals, ect. All this and traded a nearly new truck in after 9 months. That bath did me in with the General. Funny thing is it was replaced with this dreaded 6.0L Ford that has been absolutely trouble free other then a fuel gauge that failed. Its not babied either. Truth is Ford has outsold GM and Dodge combined for years and years in the diesel trucks. Last year alone Ford outsold them combined by over 100,000 units so yes, its going to look like there are more problems.
I am not saying the 6.0L and the 6.4L are perfect. We all know they are far from it. They can me made very bullet proof with some mods. At the end of the day when you look at the truck as a whole the only truck that can even come close to the Superduty Fords is the latest generation GM trucks but it still has it weaknesses.
Chris