No matter how pulpy the orange juice is, if you are drinking it in any kind of remotely large quantity (> 4 oz) you are taking in a ton of fructose that is not bound to fiber. Bound to fiber != mixed in a solution with fiber. The juicing is nothing more than breaking down the fibrous tissue of the fruit to release the bound up liquids.
Its not about the amount of fructose, it's about the amount of fructose absorbed per unit of time. Juicing makes the fructose able to be rapidly absorbed.
Orange juice has an advantage of its flavonoids. I didn't really think it made much difference until another health nut pointed me to the studies. It does behave differently than other juices.
I was a low-carb zealot until I started learning about endotoxin (I also had some random health issues on low carb like severely low blood pressure) and I started drinking orange juice again.
http://www.ncbi.nlm.nih.gov/pubmed/20067961 is just one study, there are others. I try to accompany my meals with some flavonoid-rich food or beverage. My biomarkers have not shown any indication that I am heading towards diabetes and are identical to those I had on a low-carb diet.
