Version numbers do not refer the completion level. 0.x version can be quite ready, 95 %, but it is not officially published.
What is now missing from NEM ?
Is that an essential feature ?
There are always some features to be added, but when can be said that the software is "ready" ?

I dunno what these people coming out with this 'not ready' shit are smoking. Bitcoin was up for sale for years at 0.whatever.
I don't know why it isn't on more exchanges, but ground is being lost needlessly. I have no idea why some people think it's good thing not to be over with as many people as possible.