First of all, good for Auckland. I wish my city (whose metro area has about a million more people than the entirety of New Zealand) would have the courage do similar.
However, I gotta say I'm not a huge fan of the built form of the pictured examples, with five or six detached units in a row front-to-back on a single-family lot. It would make more sense to me to build more traditional quadplex apartment buildings (e.g. like this) instead.