On Positive side.

Level 3 does reduce by many orders of magnitude the number of indoor environments people may gather.
Pawing the latest power tools at hardware store, or drinking in a bar, and musty conference rooms at work etc.

Certainly containment of this to close to Auckland seems to have been achieved.

While maybe only 50-75% wearing masks in Supermarket, it still gives virus a lot less opportunity to transfer.
Everytime someone sees someone in a mask maybe a pause to think and exercises more caution next time. 
On my trip at least people did seem to be keeping a bit of a distance either way. 
I can always try the funny walk if they don't.
Supermarket I went to was controlling numbers inside so it felt comfortable.

Well apart from 1 person who decided Supermarket shopping was opportunity to have a loud argument on their phone.

Number of potential contacts reduced by quite large numbers, this really clamps down on spread .
https://theconversation.com/how-to-flatten-the-curve-of-coronavirus-a-mathematician-explains-133514

While large groups outdoors is not ideal, its also not the same as being in an unventilated bar, or café, pictures can compress distance. 
Large number of people on narrow bush trails, well that's not so nice, people do need to think a bit.
Yeh more of an advertising blitz would have been nice to remind people.

Perfection no, but virus spread opportunity is reduced greatly, so its far from pointless.

Even so called superspreaders also need a suitable superspreading environment.
Its combination of the superspreader and a trip to one or more bars, churches , weddings, funerals, enclosed spaces etc.