NB may not make the greatest beers, but I feel they are often unique compared to much of what you find on the market, if nothing else.
Tripel is a good example of this. No, it's not a great trappist style beer. But for something relatively cheep, high in alcohol, and not hopped to high heaven, it's not too bad.
I find Tripel to be better than Abbey. I get nothing but banana from Abbey.
NB makes some really great beers in their "Lips of Faith" series, which are really good and really unique, much better than there main line of beers.