Cat Stevens.... Great Artist or Wacko?

Just bought Cat's remastered CDs. Pretty impressive. It's a shame how much more great music he could of created. We all know the story, he chose another path. Where does he rank among writers of the 70's? With all of his recent interviews and VH-1's behind the Music, is he just misunderstood? Is he coming out for all these interviews to ultimately increase sales of all the recent remastered CD releases? No matter what is behind the man, in my opinion he ranks right up there with the 70's writers/singers and his music is everlasting through time.