I don't know... I've used the ignore feature on other forums. If it were possible to completely eliminate all traces of a problem poster with this feature I'd be all for it. Obviously that doesn't happen.
The moderation on WW is first rate. Truly the finest I've ever seen anywhere and I'm all over the internet. A problem poster is going to be set straight in short order. If they persist in being a problem they'll be sent down the road. By the time you click "ignore," they'll likely already have been reprimanded.
On a side note... I think this feedback forum is a good idea but a lot of what I'm seeing here will only serve to move WW closer to all of the other thousands of forums out there. That is not the direction I'd like to see this place go.