Why are classic 4 door sedans "disliked"?

Kern Dog said

Oddly, I have found myself drawn to the idea of having an almost completely stock looking 4 door car that rides nice, performs well and looks basic. I'm talking no vinyl top, no aluminum wheels, nothing flashy. Wheel covers, white wall tires, shiny paint, a decent stereo and that is it. Maybe a roller 318 or 5.2 Magnum with a Thermoquad and dual exhaust. Electronic ignition too. Basic, reliable and comfortable.

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AKA, a sleeper.

And I love sleepers!

When my grandfather passed away in '84 I inherited his '72 Gran Torino. Putrid green in color, 32k miles (all of them City), perfect interior but rotted-out lower panels and rockers, 4 door, 250-6, C4, 8" rear end, plastic on the seats...you know the car. At the same time I was finishing-up building a "Clevor" engine (Windsor block, Cleveland heads, and Jon Kaase intake) that I was going to put in my '69 Mustang, but I couldn't help but listen to the Little Devil sitting on my shoulder that told me to put the Clevor into Grandpa's old car.....

I think out of all the cars I've owned, that may have been the funnest!