As lots of posters have said already, battery life really depends on individual usage, strength of signal, and the apps installed. But that doesn't mean it's subjective, just really hard to separate out the confounding variables. One thing that can be more useful is to compare it to past phones - is it doing better or worse than devices with a similar battery and screen size? I know my 6P (which is only about 7 weeks old) gets better battery life than any of my previous phones, and it has exactly the same apps on it that my Nexus 6 did not even 6 months ago.
So in that sense I'd say it has excellent battery life. For me that's usually somewhere between 2-4.5 hours of SoT (depending on my free time!) and 20-45% battery left at the end of the day. But my Project Fi coverage is excellent, and I'm on WiFi much of the day. I have Bluetooth turned off since I don't use it, but I don't manage any other settings.
So to troubleshoot - first is your phone behaving appropriately relative to the phone you owned most recently (not a perfect match, but presumably your apps and usage patterns between the two are more similar than they are to any of ours'). If not there might be an issue. Next, you say you are losing a lot of battery overnight - if you are losing more than 4-5% battery life overnight there is definitely something amiss. Check to see what apps are creeping up in usage overnight, or what features are waking the device. That will be your best place to start to see if there's a misbehaving app, or a simple setting that is conflicting with Doze.
Good luck!