HDR+ has its spots.... its not good for every situation, but for the ones it is... man, it takes good shots.
I think my issue with the camera is two fold.... well, maybe one-fold since it pretty much only boils down to software. The sensor is really good.... it might not be as good a unit as the IMX240 in the S6, Note 4 and G4, bit it is still pretty good in its own right. Google just needs to get its act together a little bit and tighten up the software.
a) make a device specific camera app with a good feature set. I know that sort of thing isn't the Nexus's style, but farming off the camera to the jack-of-all-trades Google Camera does the thing a disservice. Use a phone app like Open Camera or Camera FV-5... Google can do so much better.
b) Get the focus issues ironed out. The still side is MUCH improved over the Nexus 5, but it could use a bit of polish.... but when taking video, the focus bounces around every few seconds and it is very distracting once you look at it on a TV.
Other than that... I really don't have many complaints.