Well I am loving my quad cab, granted I am coming from a reg. cab ranger. But even still, I have had 5 passengers in the tuck many times and everyone fits just fine.
I suppose if you have some crazy gangster lean on your front seats, then the knees in the back could be cramped, but how i sit, I have never had any complaints. ( I am 6'1" and don't sit on top of the steering wheel)
The 5'7" bed would not work for me as I MTB 3-4 times a week and how I load the bikes, they would not fit in the shorter bed as They are all about 5"9"-6"1" long...
Now i admit more space could be nice just to have, but def. not (for me) at the cost of losing bed space.. That’s why I bought a truck as another poster said. Get a Durango if pass. space is what you need.