I'm not nearly as educated on the subject as many of the members here but I would venture to put forth that from my anecdotal research, the engines with the bad reputations were often because people were pushing the engine harder than it was designed to do. I'd point out that many of the people on the forums for these trucks fall into the enthusiast category and these people tend to push their trucks hard, either for work, play or through performance upgrades. These people can also tend to be pretty vocal when something does go wrong. The reputation of these engines may very well be deserved but that doesn't automatically mean your going to have bad luck with it.