Romeo & Juliet, wether you class it as manga or not, ( and who gives a monkeys wether it is or isn't, if you like something who the hell cares where it originated, ) is something I won't be buying.
Now, it's not because I don't like the artwork, but rather because it's Shakespeare. Some people like his stuff and fair play to them I say, but I can't stand the guy.
As for the quality of the artwork mimicing that of a how to book, personally I love Sonias artwork and to be honest, i've seen a hell of a lot worse come out of Japan, some of it as multi-volume bestselling series. :? Ok, admittedly i've also seen better, but that's to be expected considering how much longer those particular artists have been in the business compared to Sonia.