You're going to hear stories like that about every make and model. I'm not trying to gloss over what Steve is going through; everyone is going to make a recommendation based on their experience.
Here's mine: I bought my truck brand new in July of 2006. My factory batteries started to go bad around the two year mark. I waited a long time to change them, convinced it was something else. Shortly thereafter I started getting some bad running and a CEL. Pulled codes and took it to the dealership, FICM was bad, covered under warranty, and my fault through ignorance about the batteries. About 68k the trans started acting funny. Eventually got bad and threw a bunch of codes, took it to the dealership, and the trans was junk. Not covered under warranty because the warranty only covered the trans for 30k, but dealership is super reasonable and I get a Ford reman trans R&R'd for $3,300. In hindsight, I ran an Edge tuner on the truck starting at 12k, and Edge is now notorious for ruining trannys, so again, my fault, and you've got to pay to play. About 98k I though the OC went bad, turns out it probably really blew a HG then. I ran it until it hydrolocked on cranking one day at 122k. Heads came off, studs, bigger injectors, bigger turbo, etc, and no issues with 178k on it, and it now makes about double the factory HP and I'm thinking somewhere in the 900lbs/ft range of torque.
Nothing ever happened to the truck that wasn't my fault. Eliminate me from the equation and its been drop dead reliable. All things considered, the 6.0 is the best deal is a used Diesel truck, in no small part due to what I consider to be a greatly exaggerated bad reputation. I know guys who run Dodges and Chevies, and they've all had their problems too. If you could still buy a new 12V Cummins I'd have one, but I'm not going to deal with a weak kneed tranny and a truck that falls apart around a great engine that refuses to die. I'll take a pass on the DMax trucks too because $3,200 for a set of stock injectors is a bit rich for my blood. Maybe one day the 6.7 Fords will come down to Earth price wise, but they've got their flaws too. So for the forseeable future I'll continue to roll in my 6.0.