yes that's normal for a new machine and will only last a few days... right now there is a lot working in the background with doing updates and then sorting itself out. But if it continues for a week then there might be a problem with the cooling... after you have completed all the updates it should cool down.
Since this morning I logged on to make these posts, I had it on for no more than 10min and then I put it to sleep (as in I didn't do complete shut down). Now about 1 1/2 hours later I've gone from 100% to 89%. That seems a lot to me.
then you might have a rogue program/app running in the background, I suggest you see what's going on in the task manager, and do a check battery report.. also what anti-virus programs do you have running? those are notorious for draining the battery...
there ya go, those 2 programs are the biggest memory vampire hogs ever developed... both are notorious for bad battery drains and other problems try using MS edge for your browser and use another anti virus.
Edge is a rather different browser as compared to IE. The problem with Chrome is endemic to Chrome and how it has been engineered at the moment.
And, as to whether Windows has improved or not, well, the common consensus is that W10 is a sharp improvement on earlier iterations of the OS and forward looking. That has also been my experience. Of course, YMMV.
I only use Edge....using it now and your thought that Windows 10 needs Norton is old thoughts. Windows 10 is the most secure OS (much more than OSX) deployed and for 90+% of users Defender is enough...