N6 was a very good device at launch for its price, albeit a good bit more expensive than Nexus fans had come to expect.
A year later, it's still a very good phone, but from a hardware spec it - like any of its contemporaries - has started to fall behind a bit. Some people will rant about it having only a mediocre camera, but at launch it was competitive with other flagships, only trailing a little in performance. In today's terms, it's still very good, but not great - but note that the difference from the N6 to whatever one wants to deem the 'best' phone camera today isn't as substantial as the difference between that 'best' phone and an inexpensive dedicated camera.
With the pricing where it's at now, the 6 is a beast of a value - better than anything else available in its price range, providing you are wanting a 'phablet-esque' screen. It's the first time I've had a Nexus where the new model has arrived and I'm not feeling any real conflict about what it would be like to not upgrade for another year.