100% OJ is not most prepackaged juice. It is very high in many of the water soluble vitamins as well as potassium and some magnesium. That it is healthy is only an "illusion" if you're drinking way too much of it.
Data: http://nutritiondata.self.com/facts/fruits-and-fruit-juices/1973/2
I see a great deal of sugar and noticeable amounts of vitamin C. That's pretty much it. Sorry, in my book that counts as an empty-calorie sugar bomb.
I am not arguing that soda is better, but if you're taking the trouble of switching, there are better options available.
P/S/A: There are single sentences which can create life-changing amounts of difference.