As a (German) mentor myself, I am often disgusted by the unsocial attitude many of my 'co-'mentors show once it's not about their friends but randoms. Impoliteness, impatience and other 'fun' characteristics can belong to these players just as to any other person, although their mentor-status makes it even worse as they are supposed to be rolemodels.

With that, I wouldn't recommend the NN to anybody since you can never be sure if a crown-wearer is a good guy or an a******. The Internet a ka Google is a better friend for looking up any information than this chat, most of the time. A nice FC / linkshell is also a thousand times more reliable than the network.

Slightly off-topic:
In case of mentor-me, I have my stupid icon turned off - and only wore the crown when mentor-roulette forced it onto my head. (Am I glad I was done with that a long time ago. x.x ) In my opinion, people should try to properly answer other players' questions no matter the rank or title, since nobody has more or less value than another human being.

Also, as a probably annoying sidenote for you guys:
If I happen to end up these days in an instance with only mentors surrounding me, I often feel the need to activate my title "Mentor of Mentors", since it wouldn't surprise me if these players saw an opportunity to bully a let's-call-it-ordinary-user a ka minority in said dungeon-run. (Yeah, I have several bad experiences with crown-wearers. Thus the awful coward-impulse.)