We bought our MH nearly 3 years ago because we liked the overall quality, the floorplan, and the engine/transmission. I'm exaggerating a bit, but it seems as if we've replaced everything else. To answer the OP's questions about "how do you get a residential refrigerator in?" in our case the answer was remove half the windshield.
In addition to the fridge, we've replaced flooring, furniture, window treatments and lighting. Here's what it looked like last year, before the Tiffany-style light fixtures were added. None of the furniture is "RV-stuff" we wanted the most comfortable seating pieces we could find since we only have two of them.