Anything Kazuhige Nojima has written for Squenix, they all have such good potential but he finds a way to smurf up every story he has exclusively written the plot for.

Soul Taker was a cool story about demons and some wicked symbolism and design, then the author decided to make the story about space aliens.

Escaflowne was a great series about political intrigue and giant robot knights battling until the whole thing got derailed by the revelation that the story is really suppose to be about Sir Isaac Newton's search for Atlantis and his obsession with Fate.

Sliders was an intriguing series that was sadly cursed with inept writers.