Some observations from someone who was in the insider program for several months:
1) 1%-2% per hour in standby is pretty typical for all w10 phones at this point. Usage goes up as you add more background tasks that have to be updated via apps (facebook, weather, cortana interests, etc)
2) The default mailbox settings are crazy. All mailboxes come with default push-mode which causes constant network traffic (and battery drain). Knocking it down to 15 minutes will have a measureable effect
3) Turning off stuff you don't use can help. NFC, bluetooth, etc are all candidates to look at if you don't use them.
4) Turn off the "include photos from the cloud" setting in the photo app. The syncing from onedrive is a major battery hog.
5) W10 actually gets pretty good battery life in standby if it's not doing all this background stuff in my experience. For the guys testing overnight drain, try it with airplane mode on and see the difference.
6) Make sure you check out the battery saver in settings->system periodicaly to see what apps are causing the most battery usage, and turn off background tasks to those that you don't need/want to be updating all the time in the background if it's causing measurable battery drain.
7) Doing a restore on a w10 phone from a 8.1 restore point seems to pull in a lot of legacy nokia-era apps and settings which can affect stability and battery use. Make sure you've done a clean install with no restore (either out of the box or after hard reset) before you draw too many conclusions.
Hope that helps