I think Blizzard is very much following the "done when it's done" routine. They might cut content along the way, but who the hell doesn't? Every company does that, but what Blizzard is doing is telling their very early plans to the audience, which they apparently shouldn't do. Just look how that turned out, again. Everyone is all riled up for no reason at all.
The thing is, Blizzard has been very good at releasing very polished and relatively bug-free games since... forever, and that's what counts when we are talking about "done when it's done". Now compare it to most every other game at the same scale Blizzard games are at launch. You guys are just nuts.