Actually, I'd rather say that this is an unexceptional but decently unique and interesting manga receiving more negative attention than it deserves thanks to the unreasonable expectations people have about the yuri tag. Ultimately the real worth of this manga lies with Youko in her characterization and personal development. Characters like Keita, though rather duĺl and unremarkable, are not really villains/should not be considered symbols of hatred so much as representations of the limitations of an average person/society. The important part is not to like or hate him but to see how he affects Youko's character development. In that regard he is a relatively decent character (on a writing level, not a personality one), although a bit heavy-handed in the early chapters.
I hope I'm not the only one that thinks that the yuri tag almost always mean a sub-par manga when it's not plain awful. That's why you have to dig so much to find anything worthwhile within this genre. With my post before I was trying to say that this manga is barrel bottom in about every aspect: art, story, development and characters wise.
Although part of Youko's frustrations come from being a lesbian (reason enough to consider the series yuri-relevant if you ask me, unless you really just can't stand anything aside from brainless fluff pieces), the story itself is more about Youko's growth and feelings in general. For that reason the story doesn't necessarily demand a fixed yuri couple or ending (though I would welcome it, of course). I just feel that most people are completely off base with their complaints about this series. Youko's hug with Maki was a pretty remarkable character moment, for example, in the latest chapter.
I'm not asking for a regular canon yuri couple or typical development I'm asking for something that's not glaring bad in every aspect. I visit this reader because of the yuri tag but I can discern good and bad manga since I read a lot other genres. For example I have to be really, really bored to read any Touhou yuri doujin (or anything related to Touhou) because 99.9% are shit and that comes from 3+ years of experience.
TL;DR Yuri genre is sub-par most of the time. This is one is so bad the only attention it receives comes from ppl that would read anything with the yuri tag.