There is no point in pretending that Ardour is a simple, easy to use program. The development group has worked hard to try to make simple things reasonably easy, common tasks quick, and hard and/or uncommon things possible. There is no doubt that we have more to do in this area, as well as polishing the user interface to improve its intuitiveness and work flow characteristics.
At the same time, multi-track, multi-channel, non-linear, non-destructive audio editing is a far from simple process. Doing it right requires not only a good ear, but a solid appreciation of basic audio concepts and a robust mental model/metaphor of what you are doing. Ardour is not a simple "audio recorder" - you can certainly use it to record stereo (or even mono) material in a single track, but the program has been designed around much richer capabilities than this.
Some people complain that Ardour is not "intuitive" to use — its lead developer has some thoughts on that.