I just...can't stand either band, mostly for their lyrical content and overall 'life is a party' themes. I may be a Metalhead, but I definitely don't like music about the whole sex, drugs, and rock n roll mentality. I prefer lyrics that have something meaningful to say, like calling out corruption, or making something constructive out of my life by fighting my inner demons. Heck, even songs about warriors and battle are far more interesting to me. (Not surprising since I write an action comic)
Then...we can get into the actual music. Not only is it not hard enough for my tastes, it's just not that interesting to me, and doesn't line up with my perception of what is 'good music.' (there's a ton of subjectivity there, I won't even pretend to be a gatekeeper. Like what you like for whatever reasons.)
Finally, there's yet another layer, beyond lyricism and music. It is also intrinsically tied to my art and creation of characters and story. Nickelback and Motley Crue add absolutely zero to that. Plus I can't draw to it so...yeah...