The nice thing about greens is that when you cook them and the water comes out you can get a lot in a small volume. You do not need to eat massive amounts of dark greens like kale, collards, spinach, turnip greens to get the nutritional benefits of eating them.

If you are going to put them in a blender make sure that you wash the leaves very well. Remember that these plants grow close to the ground and while a regular wash will take off the pesticides it will not kill the bacteria from animals and insects that crawl on them. 

I agree with you. When you juice you will lose the structure of the plant and the fiber. Your blenderized green drink sounds great and that would be my recommendation if you cannot eat the eat it.