I suspect some of the negativity about "supermarket coffee" comes from forums like "Coffesnobs" - based in Aus.
Visit a few Aussie supermarkets, and you'll see why, the selection is grim, mainly vacuum-packed bricks, mainly imported.
NZ supermarkets have a good range of beans from local specialist roasters. Maybe not "boutique", but we have it good here.
I am a coffee snob, but I'm quite happy at times to buy from any of my local supermarkets. Consistent roast from commercial operations like L'affare, Hummingbird etc, so I don't need to adjust my grinder, fresh, vented packs, often on special ~ $32/kg.