I just upgraded from a Ram 1500 (quadcab) to a diesel 2500 crew longbed. I've had a Ford diesel f250, and a chevy crew/long C3500 in the past. The Rams have a noticeably better ride. On the highway there is no discernable ride difference between my 1500 and my 2500 (I have 1200 miles on the new truck so far). We test drove the new Ford F250 and my wife vetoed it after a few miles. We're both in our sixties and the ride was simply too rough.
She also pointed out that, at least for us, the Dodge was the most reliable truck we've had so far (they are all probably better, but I haven't returned to the other brands to find out).
FWIW: There were no problems with the old truck, but my new boat weighs 12,500 lbs on the trailer and I couldn't pull it with a half ton.
I don't really hate anything about the truck, but I can name a few things I wish were different.
1. The knobs for radio, fan, and 4WD are all close and the same shape. This is a poor design IMO as it makes it too easy to accidentally select 4WD when you intended to turn up the volume. I work in cockpit design though, so I may be more critical than most of switch placement.
2. The lighting at night is a little primitive. It seems I'm driving a vehicle from the 1990s, rather than a 2017 model. This isn't a deal breaker, but it seems they could modernize it some. Also, in certain situations, streetlights can reflect the top of the dash onto the windshield in a way the reduces visibility. I don't recall this happening with my other trucks.
3. The diesel has no gas cap (just a check valve slightly inside the fill tube). I think this is just plain stupid. I don't know is this is just the diesel or all new Rams. I ordered my own online for about 20 bucks.
4. The fuel fill tube apparently has two check valves (metal spring-loaded flappers that seal the tube). If a new owner isn't warned to insert the fuel nozzle all the way in, he will find that either: a) the fuel pump shuts off instantly or, b) he has to clean spilled diesel fuel. This isn't a problem once you know how to fill it, but Dodge should warn new users about this. I've already found that one station's protective backsplash ring (I don't know what else to call it - the circular plastic disk between your hand and the actual nozzle) makes it difficult to get the fuel nozzle all the way in.
Again, none of these are deal-breakers, and I'm sure I'd find a similar-sized list of gripes about any brand. You asked, and these are the small things I don't like about the truck.
Best of luck with your new purchase.