mmmn debatable.
I'm not too fond of anime/manga style myself, though don't take it as a hateful term. Stuff's just not for me.

What makes art art?
I side with miss coconutberry and those following on this un, mate. I personally define a lot of things, if not everything, as art-- from a flower growing of its own accord on a lawn to an Impressionistic Revival matte painting on photoshop. for me, the question's not "is it or is it not art", but "is it good or bad art?" And by "good" or "bad" art, I mean, do I like it? Simple nuff. And thus I'm totes fine with someone saying, for example, that a picture that I like is bad art. I enjoy opinions. So for me, anime/manga is definitely art. A majority of the anime/manga artist census... I don't consider particularly strong in traditional skill, and regardless I like a few mangakas.

2cents