oh yes~ I read manga for the art 50% of the time.
My favorite manga art style has got to be
Amano Akira for shonen:
and Tokeino Hari for shojo (my art is based off of this for some weird inexplicable reason).
I find that I don't like Hoshino Katsura's new art style very much. Allen looks too manly these days. Everyone has square chins now, even the girls, haha.
Before Hoshino broke her hand, her art was gorgeous though. The Noah ark art was top notch~ And she was on deadlines every week because d.gray-man is a weekly manga.