DD602 is at least a full generation back, not counting some interim changes on the 603 series.
I think dishwashers are very "personal" as appliances go. Finding a match can be tricky.
I've had my DD for 3 years. It works well, for me. I don't cook much, but it does the job when I need it to do so. As well as a Miele? I don't know. Never had a Miele. As well as the TOL GE Profile that I swapped out of my new house when I moved the DD? I don't know, I only used the GE once. I almost had a Bosch with a bad pump a few days ago, but that find slipped away, LOL.
DDs have a few flaws, that's true. Small glasses at the corners of the MegaRack may not wash well being as that's at the extreme end of the spray arm's reach. I place large glasses there, small ones in the middle or on the inner section of the MegaRack. The front/right corner beside the silverware basket is also a bit of a dead spot. Very tall items, no go. Limited on accomodating platters or cookie sheets ... although I can get in both a 12" skillet and a cookie sheet along with a nice load of other items. My 16" microwave turntable also fits, placed flat atop other items, when there are other items in the load to properly accomodate that placement. Plastic tends to not dry well, but then that's the case with any number of other dishwashers nowadays being as drying heaters are on the out-curve. That's the one real change I made in dish-use, cutting back on plastic cups and storage bowls. Not because of drying, I can swipe something with a towel PDQ and it doesn't offend my sensibilities to do that ... but because of lightweight items tending to upturn.
DDs don't have food grinders. They're not designed to take large amounts of food scraps, and tiny bits of things like broccoli may get through the filters. I also tend to cram it full as possible, having a psychological need to view a single drawer as being a full-size dishwasher, which may impede water spray around the tops of items (like that 16" micro turntable). I just have to refrain a bit from the extreme BobLoading® when I run a dirtier load.
One thing that affects ease of loading, I think, is that the rack pins are pretty tall. Small bowls of a certain depth can be unstable placed over the pins, tending to topple over. And they may not fit face-down between the MegaRack sections.
After 3 years I've got the loading tricks down pretty well. Don't want to get into micro-details on that. I've not found racks yet, in my limited exposure and IMHO, that can beat a 1970s to early 1990s KA.
It often surprised me at first. "That bowl can't get very clean, placed on that shelf above those glasses, with that other stuff in front of it." But it did. Had a few incidents of blocked wash arm. Surprised me how much still got clean.
Be glad you didn't find a 1st-series 601. Those used a rubber seal inflated by an air pump. ;-)