What are the advantages of using ADF?

From User prospective:

–          Rich interface.

–          Easy to use and/or learn to use.

–          Much information on single page (accordion layout, collapsible panel, and so forth).

–          Consistent look and feel.

–          Drag and Drop facility, etc.

From Developer  prospective:

–          Declarative way of building application.

–          150+ ready to use Rich component.

–          Multiply ways to develop and reuse components (declarative component, page template, taskflows, etc.)

–          Customizable

–          Maintainable

–          Highly decoupled

–          SOA enable,  And so forth.