I was in agony the first half of the show. Erika was weak and hurt me so much. Kyoya, on the other hand, made me question the meaning of high school romance. They made me want to stop watching. However, I admit, though not realistically healthy(or desirable), the majority of the second half was enjoyable. I felt less and less pain the more I watched.
I won't ever be able to rewatch episodes 1-6, but the rest can mostly be rewatched in my opinion. But gosh, I wish Kyoya could have spared us some agony. And maybe made a move everyh once in a while too.
I sort of got attached, just because I'm crazy....but I can say the show isn't all pain and suffering for the veiwer.