I have had the pleasure.. Flew out with them to Toronto, and back with them from Vancouver (both connecting in Detroit)
What class are you in and equipment?
I was in Economy on a nice old DC-10.. Aircraft was ok just a tad (well ok very) on the noisy side. Seats arent particulary comfortable, esp if you are on a window seat as the wall is quite flat so they jam the seats against them as much as they can which makes it feel a little tight.
IFE is a projector at the front of the cabin, ok its not V:Port but it kept me entertained (until people stand around the cabin without realising they are restricting others view[}:)]).
Service on board was also fine, much better than I had expected infact. Friendly enough crew, food not bad etc.
NWA have a bit of a bad reputation, and so I had set myself up for the worst, when infact they were "ok" all the way. Nothing to shout about, but also no cause for complaint.
Theres a summary, if there are any specifics i'll do my best;)