Ralph,
I agree with your comments. I have been a Maggie owner since 1983 and have used them for everything from jazz, folk and rock. When feed a proper diet and not pushed beyond their capabilities they have been thoroughly enjoyable regardless of genre.
The better question asked by a poster would be, "what speakers can I push really hard without fear of failure". At least that is often the way I read question like, "What is a good rock and roll speaker"?
Thus my usual reply, Klipsch, which play loud and hard and not easily damaged. Add a sub and you have a great head banging system. Their accuracy to the source is another story.