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It turned from a fun, fantasy romance into an angsty story with a slow and rather boring plot. I found myself caring way more about the secondary characters, who at least provided some of the humour that the beginning of the series did.
Ouran
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I liked the cute series, and I thought Haruhi had a brain, unlike most shoujo heroines. Turns out that she is just as much of an idiot when it comes to love as the rest of them.
In general, I dislike stories like peach girl, nana, hot gimmick, and anything similar to Shinjo Mayu smut.
Shinshi Doumei Cross started out really well, but then burned and crashed.
Fushigi Yuugi -In general, I like Watase Yuu's work, but this one I couldn't stand. Miaka is just too stupid, and I found the plot unbelievable and sometmes just annoying.
Midnight Secretary- I was expecting something more, I suppose. I gave this one up pretty early out of sheer dissapointment.
There are a lot of other 'popular' series that I dislike, but these ones just top the list. Thank goodness that there are plenty of other titles that I love.