1) It's obvious that the Jim Morrison is on there as a "OH LOOK HOW BADASS AND CONTROVERSIAL WE ARE" pick, but most of the other ones on there are very well justified and for a list of worst mainstream lyricists post 1965 (go earlier and you're confronted with stuff like the song about the yellow polka dot bikini) it isn't THAT bad.
2) However, the fact that James Hetfield isn't on it in a very high ranking for the song Frantic alone, let alone practically everything else they ever did besides the not-bad-by-metal-standards stuff like One, Fade to Black, Master of Puppets, makes the entire list invalid. How they could come up with 50 mainstream lyricists that suck and not think of him is hard to fathom.
3) Dave Mustaine also richly deserved a high ranking spot on there. About the only good lyric he ever wrote was "Military intelligence, two words combined that don't make sense" which was just funny, and the rest of the song is clearly terrible lyrically.