I find it interesting so many prefer full-justification over left-justify as the natural way to right, in our right-to-left conventions anyway, is left-justify. How many hand written or typed papers have you ever wrote that were full-justified?
I find reading more natural when left justified with irregular line lengths...what I find annoying is the very odd kerning that can happen to satisfy full justification. Plus I just do not like reading in a box.