Given the choice between having a Ghibli look the way it does, or having a little bit more space in the rear and a slightly wider door opening and it look like an A6 or 5 Series, I would go for the former every time. These are all compromises in design and I believe Maserati got the compromises on the Ghibli just right.
And I have had plenty of adults ride in the back and all have said it is a very comfortable place to be. None have said it was difficult to get in or out of. I have an 8 year daughter, so as a family car it works perfectly for me. But if you really need that extra space, Maserati make the QP..........