Yup, I agree, I looked at a 93 RM Wagon for sale by work and the interior (seats are the main thing that caught me eye) is so plain and lame. The car has some damage to the fenders down low behind the back tires and he still wants $3300. Dreamer.
The seats looked like a cheap vinyl.
Cadillac upscaled the car a lot. The car isn't the high tech Deville, and interestingly enough never seemed to be against it in sales. Fleetwood buyers are Fleetwood buyers. If you like gadgets and FWD (aka, Wrong Wheel Drive), and a smaller car, the Deville is more up your alley. For me, I like the bigger, wider, less gadgets (I do miss FDC though) car.
My thoughts are the Fleetwood had to be a major profit machine, $40K+ average price or more, and my guess is the car didn't cost GM more than $16K to make. Most high tier high end models are killer money makers in any business. Low end "mass market" stuff is often lower profit margins.
Does it make it a cheap ride? No. The seats are firmer than my 91 SDV, but more supportive, has seat warmers, has more goodies on the seats (power lumbar, power recline), a great sounding stereo stock (many will argue, but the dynamic range is actually very good on mine, decent lows, good highs, able to crank it some). Loud isn't the #1 factor, quality is what I am looking for.
My car is very solid, only rattle is new is from a overhead handle. Else the car is dead silent down the road. Quieter than any car short of a $90K S500 MBenz or $225K Bentley Turbo R. Ok, the Bentley 420 CID Turbo has the best exhaust I have ever heard, but I'm not into paying that much for an exhaust.
I have driven and compared, the Fleetwood isn't too far off from that class of machine. (compare same years, not 2006's vs 1994!) and the Cad Fleetwood has an interesting market.