I don't know how you can say that, but its your opinion, so technically theres nothing wrong with that. However.....Keff Riffhard is one of the BEST popular guitarists in the world. Those riffs he came up with may have been simple, but they stick, and his solos are amazing,(nothing compared to Led Zeppelin) but hey. Also the way he made use of open tunings, he is an allaround great guitarist.