my annoyances with Win10 relative to 8.1 are mostly about touch/tablet mode features that are worse:
* no easy way to get back to the last application like Win8's left swipe, which becomes frustrating especially when you've navigated to an app from a link or notification and want to get back to what you were doing before
* Edge's swipe navigation is nonexistent in the current TH2 public release builds, and still significantly worse than Metro IE11 in the RS1 preview builds
* Start is worse for maintaining large tile collections - no multiselect/multidrag/etc., no zoom
there's no way to somehow fix any of these with a setting, though.