In my experience, this is putting it mildly for the 3/4 Dodge diesels. I think the only more uncomfortable thing I've ridden in is an '85 CJ5.Currently driving a 2009 3/4 ton dodge hemi at work...lots of power for sure. Mileage is better than the F250 diesel, at least empty...at around 16-17 mpg. Towing its about 13-14. I dont like the ride much, real rough. So far, with only 10K miles on it I'd give it a 8/10.
For my use, I'd have to pull stuff alot heavier and a lot more often than I do now to justify a 3/4 ton or a diesel. My Avalanche pulled a full size car on a dolly 1700miles without a hitch. Don't know how that compares to others towing, just my limited amount.