Yep, the BEAT sure is the thing !
The wilder I can shake my ass to a tune, the better I love it !
But what attracts me first, more than a specific sound or instrument, is an emotion. I don't really care about the lyrics, guitar sound or musical ability as long as it makes me shake or scream or laugh or cry or whatever...I just got to FEEL something !
That said, I love chainsaw guitars, screaming distortions, reverb and tremolo, wild'n'possessed vocals, jungle tribal percussions, throbbing basses, haunted organs, bass crooners ala screamin' Jay and Mickey Mouse teenagers ala Ray Hummel III, the sound of wood you can feel with the double-bass, crazy tom-toms, sexual pulsations of an almost erotic beat and so much more... But not necessarily in the same song !
And I hate guitar solos !!!