<a href='http://www.fanfiction.net/u/544647/gunman' target='_blank' rel='nofollow'>gunman</a>
He's not horrifically bad, but he is a nonsensical bore who turns Shinji into a Gary Stu over and over again with ridiculous crossovers based on whatever he happens to like at the moment. And he just keeps writing it.
"Shinji is teleported to another universe, gains mystical powers, and marries an amazon maiden after defeating her in battle. ShinjixShampoo"
Pretty much all of his stories are some variation on that. Shinji gets superpowers, alt universe, hot girlfriend, etc. A good author could keep that interesting. He is not.
The weirdest and most nonsensical one? Shinji meets his "real" family... And Motoko Kusanagi (aka The Major from Ghost in the Shell) is his "real" mother.
Yeah, you heard me.