Most blends mean more than 50% of them. That's a rather heaping condemnation here, when, in fact, even he isn't sure. I'd like to even see one example, let alone 50% or better, of blends in an ordinarily, currently specified viscosity with current specifications (heck, even dexos1 first generation) that have only 1% synthetic in them.
I'm no big fan of synthetic blends, either, unless I've got a specific need for a high mileage oil or were seeking a dexos1 type blend for a shop setting. That being said, I don't need to worry about synthetic content to make that judgement.