D&M
As I have mentioned previous times, we had the Modern Maid version of this D&M machine from 1968 to 1973. Other than the color scheme the interior was virtually the same, only the MM didn't have the utility basket on the upper rack.
Performance wise, it certainly had good scrub-ability and cleaned pots and pans very well. The problem was little nibblets of food wastes that sometimes resided on the curved bottoms of glassware. After drying at 180 degrees these baked on very nicely.
As Larry mentioned, having a rack designed to tilt glassware would have helped. Other than this we had no problems with the top rack design. It held a lot of dishes.
My sister and brother-in-law had the D&M Kenmore with the roto-rack, and never experienced the nibblet problem, probably because the centrifugal force flung the particles off the glasses top. They liked their Kenmore. The only negative comment I recall them saying was that the roto-rack sometimes got out of balance and banged when the dishes weren't loaded correctly in the upper rack.
The D&M Modern Maid was the first dishwasher in our family, so we had nothing to compare it to. My mom really enjoyed just having a dishwasher.
If I recall correctly, rust out was the cause of failure for both our machine and my sister's. Rust out shouldn't happen in only five years.
My dad replaced our Modern Maid with a General Electric Americana. Now we had something to compare the Modern Maid/Kenmore/D&M design to.
My mom exclaimed about our new GE, after a couple of uses, "I never thought a dishwasher could be so good!"
The D&M dishwashers did the job...so much better than having to hand wash dishes. But there were better options out there.