We can say the editor is powerful, yes. But I can absolutely confirm it's "NOT USER FRIENDLY" at all.
Buttons everywhere, a content browser where you select stuff like UE3, missing tooltips, no helpers, workspace never saved, missing undos.
I think it's worse than NWN2 ( a tool from 2006 ) in term of usability. But in NWN/NWN2 the goal was different.
I hope Larian will reiterate a bit more on UX for the D:OS 2 editor.