There is a lot of things to be unhappy about with the new GFE/Nvidia drivers.
The new nvidia drivers/GFE come with a bunch of extra services (like before).
But instead of having several of the services running as their own, allowing you to disable them individually (like the Shield service, Network, etc..) they have now bundled them into:
Nvidia Localsystem Container ("C:\Program Files\NVIDIA Corporation\NvContainer\nvcontainer.exe" -s NvContainerLocalSystem -a -f "C:\ProgramData\NVIDIA\NvContainerLocalSystem.log" -l 3 -d "C:\Program Files\NVIDIA Corporation\NvContainer\plugins\LocalSystem")
Nvidia Networkservice COntainer (C:\Program Files\NVIDIA Corporation\NvContainer\nvcontainer.exe" -s NvContainerNetworkService -f "C:\ProgramData\NVIDIA\NvContainerNetworkService.log" -l 3 -d "C:\Program Files\NVIDIA Corporation\NvContainer\plugins\NetworkService")
Nvidia DisplayContainer (C:\Program Files\NVIDIA Corporation\Display.NvContainer\NVDisplay.Container.exe" -s NVDisplay.ContainerLocalSystem -f "C:\ProgramData\NVIDIA\NVDisplay.ContainerLocalSystem.log" -l 3 -d "C:\Program Files\NVIDIA Corporation\Display.NvContainer\plugins\LocalSystem")
Nvidia Wireless Controller Service (Which is awesome when you do not have a Wireless device..)
You will notice that two of those services run the same "nvcontainer.exe" which means that you will get a lot of prompts from your firewall unless you give it full access - and you cant really "block one" and "allow the other". So even more 'into detail' settings are required.
GFE also runs in an interesting mode upon first launch (the wizard!) in that it automatically starts scanning most of your hard drives and ANYTHING that includes the word "game" in it to see if anything matches a master list at Nvidia for applications, too see if they have thumbnails and configuration files they can automatically download from the internet to your install folder (which is probably on an SSD now..)
This happens every time you launch GFE and also seemed to be running in the background while you were doing other things and not in the GFE user interface, were I'd have 10+ NvContainer (or something else) processes with various arguments for game-name a, b, c, etc... where it would try to download data.
You do have an option to disable the auto scan and whatnot, but that one is only available inside a text file in one of the nvidia folders... Upon the first launch of GFE you have no option but to allow it to start scanning etc, to click through the Wizard to actually complete the installation, then LATER on you can tell it to only scan one folder instead of all the folders it defaulted to and/or found (c:\program files, c:\games, d:\games, e:\games, etc etc etc..).
Once you've done that, you can go into the nvidia folders and delete 500+MB of thumbnails showing all the graphic options for the games you have installed with settings you will never let GFE mess with since thankfully you could still set it to "NOT AUTOMATICALLY EDIT THE CONFIGURATION FILES FOR ALL MY GAMES" (Probably going to be defaulted to YES in a new version...).
Another fun thing is that the new Overlay for streaming/capture is no longer a normal windows UI element, but its own "thing" with a custom file browser that is drawn on top of everything on your screen. The fun thing is that, if you for example want to input your Twitch login details, you have to use the new "overlay" UI to enter this information, but if you wanted to alt-tab to say, keepass to get the password, the steps in the Overlay UI are reset (since you are basically quitting it to return to Keepass and get the password) and you have to start from step 1 again.
Oh yea; Had to login to start the thing at first.
If I'd know the new verison of GFE would be Windows 10 level of shit I think I'd have stayed back on 2.x version I had running before..