To Heart - Literally barely finished the first episode. Pretty much put me to sleep.
Yamato Nadeshiko Shichi Henge/The Wallflower - Was a decent enough series, but the uneven animation quality annoyed me, and I was watching too many other much better series at the time, so had no time for it.
Tsubasa Chronicle - So wanted to like this as I adore the manga, but the animation was horrid looking and stuck so often to boring pans or still shots to fill up time, the characters were ugly (the ears!), and the series was drastically cut and alerted to fit a younger audience; If it does get its third season, I have no way how they are going to do the X crossover without cutting out most of the material. I swear never to watch another Bee Train series as from the others I have seen made by them, or ones friends have watched, all suffer from the same problems. I was actually so angry it was poor (and is almost universally hated by most big CLAMP fans). Though most of the voice acting and the music was fantastic. Such a pity.
Final Fantasy: Unlimited - Just poor, so damn poor.
Inu Yasha - I've had the first 90 episodes for a number of years thanks to a friend, but although I'd like to try it out, I think it's a little too late in the day to do so. Think I've only seen the first three episodes.