The 3 main reasons why I hate Kimi ni Todoke, and why I went so far as to make an antifanclub for it:
1.a Sawako is misunderstood.
1.b Social introverts/outcasts want to think they're misunderstood.
2.a Kazahaya is popular and has a crush on Sawako without her doing anything to directly attract him.
2.b Social introverts/outcasts want to have a popular guy/girl(preferably nice), have a crush on them for no reason.
3.a The characters in the anime still hang out with Sawako even after she has no personality.
3.b ..... You get the idea
Basically all these reasons center around a show solely based on fanservice, dare I say more so than ecchi? Basically this is a loser 13yo fan dream, and I think that premise makes for a shitty anime.