It’s not as bad as it used to be.
Unfortunately at least one of the developers think that the current release version of NR is good 
Having used many other Noise Reduction tools, there is IMO, still some way to go, but results so far are very encouraging.
I am personally very keen to see this feature improved as good Noise Reduction would be a very good “selling point” for Audacity, and it would save me the hassle of switching between applications when I have to clean up noisy source material.
As there are several different approaches involved I think it would be very helpful to have an overview page on the Audacity wiki. We could also have a set of test samples on there which would allow fair comparison between different NR methods.
Personally I find wiki formatting highly irritating and totally not user friendly, but in this case I think it would probably be the best format for holding an overview and a review of test results. If we include the posts in this topic, there have already been over 10 pages of posts on this subject, so I think an overview page is essential for keeping track of developments.
Since you (Marco) are most actively involved with developing this feature it would probably be best if you started off the wiki page, but if you’re uncomfortable with posting to the wiki I could get it started off on your behalf.
For quicker and easier access to posting new patches, discussing ideas, and returning test results, I can make this a “sticky” topic on this forum board. This will hopefully encourage other Audacity users to contribute with ideas and test results.
No, not yet, but I’ll try that.
Yes, that would be a good “revealing” test. That’s exactly the kind of thing that I have in mind as part of a set of “standard” test samples.
Do you have a suitable recording with real world noise that you could donate?