Sort of expanding on Rich's point, CR is a very useful reference for finding out about the features of various products, which does not require you to take the actual rating as gospel. I.e., in its introduction to dishwashers, CR will list and describe the pluses and minuses of various dishwasher features - i.e., soil sensor, adjustable racks, types of filters, stainless steel tubs, various wash cycles, hidden touch panels, etc. Even if you didn't read the ratings this would be helpful because you might notice at the store that the dishwasher you were looking at didn't have a filter or soil sensor (or whatever).
I agree that CR is less helpful for technology, since technology is something I keep up with. But most people probably only buy a dishwasher every 15 years or so and probably haven't followed dishwasher tech in the interim.
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