I can't relate to many reviewers pov that this show swiftly becomes downright moronic after a good premise. I think it just starts pretty light to get progressively more serious and complex (and sometimes yes, soapish and melodramatic), and that, apparently, doesn't please everyone.
For me, what kept the show together was precisely the lead female character bipolar personality, and the uncertainty around her feelings and behaviour (in many respects a darker kind of Madoka in Kimagure Orange Road ?). It was greatly supported by expressive art concept and drawing in critical scenes, by a good pacing of tension buildup and release, and by numerous well-thoughtout situations (eg the photography contest scene). I'm also thankful that the mangaka didn't rely too heavily on quiproquos and misunderstandings to push the story forward, making it feel more realistic than many titles i've read. Instead I find she did a good job at smoothly creating intimacy between the protagonists.
On the other hand, it's a pity she took the easy way out by just bringing down most of the credibility of male "competitors", leaving the MC as the only "default" alternative, reducing the ambient uneasiness and insecurity. There's also this universal shounen/shoujo (damn) feature that the whole universe is strictly limited to the MC's microsphere, without any casual external event whatsoever to pepper things up. But the one thing i could barely stand was the constant – and always counterproductive imo – MC's introspections and the surreal abstract sentimental lectures, to the point i eventually started skipping a lot of text.
Although overall it was too long for me too, with this genre i prefer too long over too short since it gives time to flesh out the characters and their relationships, even at the price of occasional lack of originality, repetition and awkwardness. Perhaps i enjoyed it more than most because i read it within a few sessions once it was complete ; or perhaps, as someone prompted in another review, i'm a masochist (and a moron on top of that) for being swallowed into these whimsical love games, for ending up feeling like "i want to go back to those days" ?