Lyrics (subject, skill, depth, meaning, symbolism, uniqueness) * rhythm * (notation/orchestration (including vocals, especially rap-singing, and more especially if it's actual singing) *style aka "swag") * (arrangement = purpose + abstraction) = arrangement(x) = duration) * uniqueness = quality
That's the musical part. The rest are gimmicks, which the media uses to promote certain styles, sometimes making others less cliche. It's all about profit and easy ways to do it; more business-oriented and deceitful than real. Why not be real and fervent in business? It takes more energy; something that only a lover of art would or could contribute.
Dynamics of the sound of the guitar (+/-/0) * rhythm (impossible techniques and speeds make the guitar sound either fake or like a unison of multiple players in one band, possibly doing it wrong) * octaves/chords/notation suitable to a guitar (a million bass notes w/ a million high notes will not reciprocate properly, nor will it sound natural, even if there are a million people playing; the mathematics must work in law of reciprocity) * physics of guitar playing (strums, power chords, regular chords, solo strings, bass-acoustic-electric relationships) * quality of sound (bit rate/sample rate/interpolation/etc) [+/*( more if necessary or applicable)] = overall quality and actual effect, since realism plays a role, though the electronic and digital can enhance that nature.
Only you know this. We all can make calculations of limitations for ourselves and find ways to raise those limits, which of course, have a given maximum that we may not know. It's wonderful to know what NOT to do.