I will avoid the arrogance and ignorance of certain posters and reply directly to the question. The upper range of Marantz AVR are quite good. They are among the few manufacturers who do actually listen and tune their equipment for sound quality.
To avoid multichannel audio at this point reminds me of the pre-stereo 1950s audiophile with one speaker in the room declaring stereo is ' just a gimmick, a passing fad".