Nah, the system works well. At least I haven't notice any bigger bugs in recent builds.
The main problem with Win10 lies elsewhere - it's once again a mishmash of various design languages as shown before in the
right-click menu comparison. It's both better and worse than Windows 8 (depends on how you look at it): in Win8 there was a clear distinction between modern elements (fullscreen aps, start screen, charms bar) and old elements (everything else). Modern apps looked and acted completely different than everything else so it was like jumping between two different OS. Win10 mixes modern elements (start menu/screen, notification bar, various elements in taskbar, modern apps opening in windows etc.) and old elements so now it feels much more integrated, like a single OS, but the difference in UI elements can be a bit jarring.
And official apps are mostly meh: they look nice but for desktop apps (and sometimes even for mobile apps) their functionality is very limited.