Vehicle problems experienced probably depend at least as much, perhaps more on driver rather than truck brand.
I've put a total of 670k miles on three Dodge Rams and never experienced a fraction of the problems that some TDR members report.
Evidently, more bad drivers bought the hd ram diesel in consumer reports than the other brands then? Because they're bad drivers, they had more problems, became disgruntled, and thus filled out the survey. Thus the bad report card. You disagree with the bad report card based on your 670k miles of trouble free experience. OK.
I only have 50k on my '08 6. 7 and it hasn't been trouble free - mostly emissions related which are issues that aren't fixable. Think about that, not fixable. If it's not fixable it must be the drivers fault. The regen didn't complete because me the driver wasn't working the truck hard enough, so the sensor/filter/whatever plugged up. "These trucks were meant to be beat" was what the tech said to me - my bad. Course that was the early days < 1k, there were some absurd # of regen attempts and no completions and flash #x of #x+20 was supposed to correct it... ...
So, the best thing to do is to become a good driver and don't idle, no short trips, work it hard for its limited purpose, run the exhaust brake, heck avoid using the cruise control so that the VGT keeps on working. And use the 13 year old but reliable gasser for getting groceries. Works for me.
Guessing a lot of your 670k was prior to the 6. 7?