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If parallel fifths aren't kosher, then Led Zeppelin, the Beatles, the Rolling Stones, AC/DC, Guns n' Roses, and just about every band ever sucks. And they don't. Plus, the texture of most songs done by bands is homophonic, and the part-writing rules are more for polyphony. If you write vocal harmonies for a rock song, it might be cool to avoid parallel fifths to make the sound more lush, but it really doesn't matter. What the fuck kind of music fan doesn't pick up an album because the guitarist uses power chords?
But once again, using your knowledge of music theory to your advantage but not letting it restrict you is the best method. I'm in a hair metal band with a music major from my school, and when we write riffs, we say the nerdiest, most theory-laden shit about it, but in the end, we just do everything possible to ensure that it rocks.
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