NN worked fine for me in SE dry forest, Chilterns, Afan (picked up a downhill KOM on my NN shod asr 5), the peaks and even SE winter mud.
They are pressure sensitive, I run mine tubeless 28F 30R and they do wear quickly on rocks and road, and snakeskins prevent sidewall tears.
Other than that the biggest comments missing from most of the these tire threads is as follows:
A) mud/dirt/rocks consistency is different all over this country so you can't just state "they don't work in mud" etc. it's a ridiculous generalisation often ignored.
B) tyres are subject to your rising style. I get on with mine but as I'm not a "leaner" or "carver" of a bike I don't get on with tyres that have a large transition between centre and edge. My point being that I could bang on about High Rollers being rubbish - but they aren't, they just don't suit my style.
So the combo of terrain and style is important to factor in.
Op, the thing with a NN is to let it settle into a corner - the outer will bite but there is a momentary pause before it does which can be off putting if you are not used to it. That said if you can't get used to it try something else.