Stuff like You're beautiful (with all it's remake : Fabulous Boy, Ikemen Desu Ne), Heartstrings, Coffee Prince and Dream High, I watched it when I was 11-14 years old so I kinda enjoyed them. So I can't really say there are the worst . Even if I must admit that I wouldn't be able to watch any of those in the present days ( I tried it was a bad Idea). All of those are pretty much the same old romance story with just a change of scenery ^^ After a few of those it's understandable to be bored.
But stuff like Fated to love you and Playfull kiss, I just can't accept that. In Fated to love you, I excepted something mature since the main leads were adult and not high school student. I got something below elementary school student romance. Below !!! Everything was so ridiculous. But the worst was the misogynism or sexism or whatever you call it. Yeah sure there was a bit of that in stuff like You're Beautiful but in this one it reached a whole other level.
Let's just not talk about Playful kiss (How could this have so much adaptation ?).
Another deception was You Who Came from the Stars. I watched half of the first episode and dropped it. The male lead was unoriginal (if they actually taught that the alien thing made him a little bit original, they were wrong) but I like cold-hecarted bastard. When the female appeared, I couldn't believe "that" was a female lead. But it seems that it's the case. For the first time in my life, I tough weak-willed, ridiculously naive and cry-baby heroine weren't so bad after all.