Before I get started I feel like I should mention that I'm a huge Android fan and this is the second Nexus phone I owned. This might influence my opinion on the phone, but I will try to keep it professional.
Now on to the review. In my opinion, a great phone should tick all the things average consumers look for in a smartphone. That's a clear, satisfying display, smooth performance through everyday tasks, a camera that just does what it should do and a battery that lasts as long as you need it to. If all of this can be achieved at a reasonable price, it's a great phone. So how does the 6p stack up to these requirements...
The 6P rocks a 5,7" 1440p AMOLED display which, to most people, doesn't say much. But the screen is great. Nice saturated colors and really crisp visuals. Good luck spotting pixels on this screen. I love the phone mostly for the combination of the big screen and front facing speakers, this because I'm a huge media consumer who watches lots of videos and browses the web almost 24/7, both of which work great on such a big screen. Out door visibility is OK. At ~75\% brightness it might be difficult to read in direct sunlight. But bump it up to ~100\% and there will be no problems.
I personally hate it to wait for my devices to finish loading, whether it's a phone or PC doesn't matter. So me saying the performance of this phone is great says a lot. This phone is starting to age but to me it is still a great performer. I think it is still capable of competing against the newer flagships like S7 edge and G5.
One of the phones biggest selling points next to the stock Android experience is the really impressive camera. When HDR+ is enabled the phone will amaze you with every shot it takes whether is in overexposed areas or in near complete darkness, the pictures will be sure to get you likes on your Instagram posts. A friend of mine owns a Galaxy S7 edge and I must say, the pictures are very close in terms of quality. The S7 might have the "edge" (no pun intended) in some conditions but photos will always look great.
The biggest con of this phone is it's battery life. Some people online talk about 5-6 hours of SoT (Screen on Time), but I rarely tip the 4 hours mark. Than again I would classify myself as, the so called, poweruser with lots of video watching, gaming and 24/7 music playback. That said, the USB-C port allows for some very fast charging which will fill up your phone in no time. the first ~75\% will be in there within 45 minutes. Short periods of charging work great with this phone and are actually preferred with modern batteries. In short, you will very rarely find me with a dead phone in my pocket, that's if I didn't forget my charger...
This concludes my review on the Nexus 6P. if you are looking for a new smartphone that's great at media consumpion or just an overall good performer, definitely look into the 6P!