In my experience, the term “quality blended whisk[e]y” is an oxymoron. White Label is better than most, certainly, but the whole point of drinking whisky in the first place is to be drinking something that is unique, and not homogenized for mass consumption.
Now, that’s personal opinion and taste on my part.
The reason why I grew up not wanting to touch any product of Dewar’s, however good the quality might be, is that I was taught from an age well before I could drink that Joe P. Kennedy Sr. had been the sole agent for Dewar’s in the US and that all those among the Scots diaspora who were drinking any Dewar’s product, thinking they were getting a taste of the homeland, were in fact enriching the contemptible Kennedy clan of Catholic Irish.
What else don't you enjoy because it's owned and/or influenced by those evil rich people/families/companys/farm cooperatives/corporations/catholics???
A popular opinion, to be sure. There are very high-quality whiskies coming onto the market, both blends (malt and grain whiskies) and vatted/pure malts (multiple single malts combined for effect). Compass Box is one such independnet bottler that specializes in this. I'd opt for a bottle of their "Spice Tree" over JW Black any day.