New
#21
The inclusion of a Start Menu, Search Bar, Metro Apps on the Desktop and not to switch to a separate screen for the Start Screen and Metro Apps already makes Windows 10 better than Windows 8.1 for me even though I haven't tried it just yet.
Now add features like Virtual Desktop, Notification Center (which replaces Charms bar essentially), manual Tablet Mode and a more unified look/theme of the OS...I think Windows 10 if anything is an improvement to Windows 8.1 especially for laptop/desktop users.
As for the things Windows 10 does not do as good or seen as annoyances vs Windows 8.1, I think Microsoft is looking into fix these things before the release to RTM, if not; a major update in the form of Windows 10.1 next year to fix such annoyances is a very real possibility.
Furthermore the annoyances in Windows 8.1 that have been removed/fix in Windows 10 such as the charms bar, apps switcher, top edge desktop split (basically all edge related stuff use for laptop/desktop users) outweighs any minor annoyances with Windows 10 which can still be fixed with future minor/major OS updates, whereas Windows 8.1 as I see it is EOL for any major updates in future (only security and minor bug fixes).