My 2017 Dodge Ram 2500 with the 6.7L Cummins has been just about flawless. I've had zero repairs done to it, other than a few things that never failed but were recalled. It hauls ass, pulls whatever, and is comfortable. I love driving it and will most definitely buy a new one in a few years.
The Ram of today is a completely different truck than the Ram of just four or five years ago. I originally planned to buy one in 2013 and went to look at them and they felt like pieces of shit. Decided to get the LR4 instead. Then got back in the market for a diesel pickup in late 2016 and looked at the Fords and GMCs, not even considering the Ram because of the previous experience.
Went to the Ram dealer for the hell of it one day at lunch and was blown away. It's changed completely. The interior has been fantastic. Much better quality and the electronics are far more intuitive than the LR4. It only took one test drive and I was sold. Forgot about the Fords and GMCs and bought a Ram the next week.