In recent years the appliance industry has greenwashed their dishwashers quite successfully. It is now commonly understood that a human could never do dishes as efficiently as that magical mechanical servant under your counter. I am skeptical.
But then, I am a fan of hand washing my dishes. It is one of my simple pleasures.
I don't want to ever be too busy to do dishes, or to cook my own food, or grow a garden, or write a letter, or simply do nothing. Maybe dishwashers make us feel more stressed, rather than less, in that they give us more time to do things less healthy and stress-relieving as a good session of hand washing dishes.
While I may use more water than an ultra-efficient dishwasher (or do I?), I do not use any additional electricity in the washing or the drying.
Another irritant for me is the noise dishwashers make. Doosh, doosh, doosh, doosh, doosh...click, whirr... How am I supposed to hear the birds singing, or wind blowing with all that mechanically malevolent mumbo jumbo?
Today's dishwashers sure have cleaned up their reputation as energy hogs. Now they are the green way to go, so if you don't have time, or don't like to hand wash, you can use your under counter dishwasher without guilt.
I'm still skeptical. I think the most efficient dishwasher ever is the one you don't use. Super efficient and green, just like hand washing.
That is why my dishwasher is more of a closet than a mechanical kitchen "aide". It is very efficient in keeping the clutter off my counter tops.