Well, people definitely have different opinions on what's pretty art, that we know. Personally, I found the artwork in Nanahikari simple, clean and easy on the eye. The only problem being that the different characters are too easily mixed up (sadly, this is quite a problem, since the cast is pretty extensive).
I haven't stumbled upon a yaoi manga with this kind of plot before, but still, it contains quite a handful of the typical BL cliches. Nonetheless, it has about the same effect as a soap opera, driving you to read on and see what happens next. In some sequences I enjoyed reading it, and in others I was utterly appalled by the characters. But ultimately, it was entertaining.
But this manga's biggest flaw is it's characters. They're just so extremely flat. I feel utterly NOTHING for the characters, especially the three main leads. They're like empty shells. Nanamura Hikaru (main lead) has no personality and no backbone. His emotions and reactions feel so damn animated and fake. Shimogura Hirone (the attorney) has no backbone either and his sudden love for Nanamura Hikaru really doesn't come across, even when extreme measures are taken in use. Ashinuma Ushio is no exception either.
And what the heck is up with
Ushio raping Hikaru? You call that rape? And if it's called rape (though I find it silly, since Hikaru was like "oh, okay" and afterwards ".....I JUST GOT RAPED?"), why the HECK don't they deal with it in some way? It's like... "Ah, yeah, I'm sorry 'bout dat, we clear?"... Jeez. Oh Jeez. I can't take it seriously.
I find above-mentioned things annoying, since this series tries to be serious. But it feels like a joke sometimes. It's just so flat! I'm seriously amazed at how flat it is for a 7 volume series. All these flaws taken into consideration, I was actually pretty entertained through these (currently) 6 volumes (I'm embarrassed by this fact). It's completely like a soap opera, it's horrible, but you can't help but read on.