[Katsunami]

Maybe this comes across as a stupid remark, but I really believe the following to be true to some extent: calibre's usability or learning curve is basically unimportant.

Why?

1. Someone not willing to study calibre is problably unwilling to maintain a huge library and will just use Adobe Digital Editions, Kindle 4 PC, or maybe even download books directly from the Kindle/Kobo cloud.

2. Someone looking for a program capable of doing what Calibre can do, basically has no choice. You use Calibre, or not.

Calibre can focus on functionality and power instead of userfriendlyness, because if you need or want calibre's capabilities, you must study and use it, whatever GUI it has. If you don't like the way it works: pity for you. There is no competitor in town.

In short: at this point, many people who are using Calibre don't really care about the interface, or dialog layout, and so on. I see many points that could be improved if (as user_none states) a base line would be drawn, such as: "We make it work like in Windows/OSX/Linux/like app X." However, doing this will improve usablility for some, and degrade it for others, so this will not happen.

At this time, Calibre is Calibre. It's different from any other program I've ever used on whatever platform. Does it matter? No, because there is no viable alternative.