Summary: The Denon AVR-789 sounds great and is fully featured, but isn't the easiest receiver to set up and use.
Pros: Three HDMI inputs; onboard Dolby TrueHD and DTS-HD Master Audio decoding; Sirius and XM-ready; upconverts analog signals to 1080p over HDMI output; automatic speaker calibration; decent video quality on upconverted video signals.
Cons: Terrible remote; difficult setup; competition offers more HDMI inputs for less money; no graphical user interface.
Conclusion: Positioned as an entry-level receiver, the Denon AVR-789 is neither the most thoroughly equipped nor the least expensive, putting it somewhere in the middle of a growing field. It does offer the Denon pedigree however, evidenced by its terrific audio performance, so if the sound matters above all else, consider this affordable, versatile component.
Pros: Excellent audio performance, especially when customized in setup, Generous analog video support, with upconversion
Cons: Upconversion of analog/SD sources could look better, Remote, menus and overall design can be frustrating at times