Sweet Valley High/YMMV

Broken Bird: Elizabeth, in Sweet Valley Confidential. Alone in New York, estranged from her sister and basically making her living sneaking into off-Broadway plays for a third rate magazine that reviews off-Broadway plays, and socially isolated from everyone, even the various one-night stands she has.
Broken Base: Some laud the Junior High and Senior Year series for showing a more realistic portrayal of teenage life - while others condemn the series as being boring, compared to the earlier series.
Crack Fic: Many outlandish events occurred, but surely The Magic Christmas, in which a pair of harlequin dolls transport Elizabeth and Jessica to ~~Narnia~~ a fantasy land where they assist twin princes in defeating an evil wizard, must qualify.
- Don't forget the Sweet Valley University book in which one of their professors turned out to be a vampire.
Creator's Pet: Elizabeth Wakefield is purported to be the good twin who is nice to everyone - but, more often than not, she comes off as a meddling, sanctimonious hypocrite. As such, many find her to be even worse than the allegedly bad twin, Jessica.
Draco in Leather Pants: Even the writer was amazed at how much fans preferred the "bad twin" Jessica (who fans saw as more understandable and interesting) to "good girl" Elizabeth (who fans saw as hypocritical and self-righteous).
Ear Worm: "Look right down in the crowded hall, you'll see there's a beauty standing..." You're welcome.
Ensemble Darkhorse: The Lila Fowler and Winston Egbert fans are quite plentiful.
Mary Sue: The twins are, in their separate ways, canon examples.
Snark Bait: Even many hardcore fans of the series are more than willing to admit that the books are not without their flaws.
- The members of the wonderful 1bruce1 community on LiveJournal have snarked nearly every book and TV episode.