It doesn't mean that I like any aggressive music. I have several criteria for evaluating this kind of songs.
The most important parts are guitar/bass/synth riffs and vocals. These two have the same highest priority.
The riffs create the base rhythmical texture of the song and should be sophisticated enough to make the music interesting and groovy (Fear, Stupify, Damage Inc., Bodies, Meet the Creeper). Also there should not be too much solo guitar, maybe some short funky fragments to vary the main texture.
The vocals should sound solid and aggressive (James Hetfield, David Draiman, Rob Zombie, Dexter Holland, Chris Cornell) but singers should not use any of these freaky techniques like growling or screaming too much. Rapping is OK though (Zack De La Rocha). …