The cruise was alright, but a crew member stole my soccer jersey from my cabin. I'm sure they do it all the time too - it's the kind of item that is untraceable and low enough in value for NCL to not care. You can mail a stolen item at any port after you get off the boat, so how can they get caught?
Deck 8, Port forward - watch out.
The fact that NCL doesn't care that their crew members are doing this is the worst part. After 1 hour on hold waiting for customer service they told me nothing could be done unless it was in writing anyway . . . so I had to submit a complaint on paper or online.