[kovidgoyal]

@maara: Lots of people have, very politely (far too politely in my opinion) asked you for specific improvements that you have to suggest. You obviously do not. Move on. You are wasting people's valuable time.

Let me emphasize, once again: Your suggestions must not remove functionality from the interface.

On a general note. I choose to believe that calibre's users are not children. They are capable of learning to do complex things and they appreciate the option to do so. That said, the basic use case of calibre, add a book, connect device, send to device is utterly simple, as evidenced by the millions of people that use calibre. calibre only becomes complex if you want to do complex things.

And finally, the calibre UI is an example of beautiful and careful design. It is design that allows you to do the tasks that you need to do with the minimum of effort. That design has been refined over years of specific feedback from people that use calibre.

About the only criticism of the UI that I'd agree with is that it lacks graphical effects like shading/rounded corners/translucency etc on windows and OS X, which gives it a "outdated" appearance.