I did not use the word "junk", as it surely seems to work well in some engines.
I said crappy. This is because of the many reports of different quality levels US-wide I have read here, ranging from quick gunk formation to uncontrolled amounts/concoctions of oxygenisers which can have a negative influence on Walbro parts and bearing seals. It is to be understood in relationship to the European uniform standards. I see no negative reports on these fuels.