Before bashing, you might want to actually look up the specified protein. It's full of isolates.
Although, I'm totally on board with keeping nutrition simple. I just think that ON makes a good product.
There are some "Fillers" in Optimum's Whey, but that's not necessarily negative. They put in things like lactase and other digestive enzymes (very helpful if you're lactose intolerant), plus they include 4 grams of glutamine and glutamine precursors as well as 5 grams of BCAAs (leucine, isoleucine, and valine).
The lactase is one of the reasons I like Optimum's Whey and what got me to buy it the first time. As you stated, the fillers aren't a bad thing either. I was just curious, maybe he knew some other "fillers" that I didn't know about As you said, Optimum Nutrition's Whey Protein is a good product.