Thanks for taking the time to reply!
I never said it isn't useful. I said I couldn't classify it, so there you are arguing against someone else.
I don't see why building a 3D game (or a partly 3D game) would be easier in the 2D game editor C2, when you have to first program your own 3D editor, as you stated? Isn't that what other 3D engines already offer?
"making 3D html5 content, and there's really nothing else like it around"
That's not true. For example, Unreal works very well in HTML5/WebGL. Or what about this one? But I agree that Construct's event system is more accessible.
But enough of that. I said I couldn't classify it. Thanks to your answer I now can.