For me, (and I love Alice Cooper) he ceased to be interesting after Muscle of Love and honestly I feel the apex of his career was Billion Dollar Babies - Glad I got to see him on that tour! Seattle FM radio killed any (of the little) affection I could muster for Led Zep. That said I like Plant as a solo artist, mainly because he continues to try new things, he'll never do what he did (vocally) with LZ so why live in the past?