Popular Shojo that should never have become popular:
Absolute Boyfriend-the manga is all about sex. mentioned nearly every chapter, and Riiko doesn't deserve to have a BF! She is so annoying, and actually, nearly all of the characters are. The sex doll who keeps pressuring the airhead heroine who is BFFs with a childhood bud who watched her get rejected again and again and only added to her misery, instead of confessing himself. Sheesh, you've done it again, Watase.
Vampire Knight-Truthfully, this one started out pretty good. At around chapter 20(?) though, I started getting a bit bored. The melodrama NEVER ENDS!! At least it had good art.
Special A-I really didn't hate this series. It was quite funny, and I loved Tadashi and Akira, but I didn't like the idiot main character. So slow! I don't have enough money to give to this long a series. Maybe if her new series is shorter by about 10 books.
There are probably more, but this is all for now!
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"If you think being eaten by a carnivorous tree is something that only happens to someone else, then think again."
--Shades of Grey, by Jasper Fforde