I really enjoyed this series in the beginning. The subversion of shoujo cliches is executed successfully and I appreciated that Hatori was a human character. She's probably not likeable to everyone, but I liked her, and how she's shameless in what she wanted. It makes her more human. And if nothing else, her facial expressions are always entertaining. I also enjoyed her interactions with her ever-suffering friend Nakajima and the other love interest, Hiromitsu. Both ended up being necessary and sympathetic characters. Rita, on the other hand, turned out to be an irredeemable asshole. The more page time he had, the crappier he got and the more I wanted to burn him. (Compare and contrast with Hiromitsu, who demonstrated that he had the capacity to change for the better). I thought that was okay, though, because I could deal with Rita if his assiness was used to fuel Hatori's character development. But then everything that I thought this series was building up to got chucked down the gutter. Whoops. Just when I thought this series (read: Rita) could no longer raise my blood pressure. No such luck.
Maybe it's because my hopes were misplaced, it just became so exhausting to read by the end. That said, if you can just get into the zone of no-longer-caring, it's not so bad. By the time you get to the haphazardly slapped-together ending, it's just easier not to be disappointed. It's unfortunate that a funny series with an unconventional heroine ended being a shitty romance about emotionally stunted teenagers that don't know how to respect each other, but what can you do.
I still give it 7/10 for the number of times it made me laugh.
EDIT: Revised, b/c I noticed how messy my original comment was.