We here at Eastern Standard strictly define the word manga as comics from Japan. It is impossible for manga to originate from anywhere else. This is not a reflection on the quality of anything non-Japanese that calls itself manga (although it is mostly shit) but - as I just now decided - rooted more in horror at what the implications of OEL 'manga' are.
When manga is just comics from Japan, all styles are supported. You can draw big eyes and small mouths, very realistic gekiga stuff, or much more stylized, unique artwork.
The moment we start defining manga as an art style, the way OEL seems to, we start to reject anything that doesn't meet that narrower definition. Certainly, there are certain stylistic tricks you see in a lot of the most successful books, but even there, you'll find people bucking the trend. Even beyond the simple visual look, the pacing stuff - decompression and the like - that other people ascribe to manga? Read a little Gintama and see how dense that fucker is.
Someone recently started a Wikipedia article on his fiction zine, which claims to be the first OEL light novel magazine. The very idea made me livid, and I wasn't quite sure why - beyond the obvious fact that light novel is simply the Japanese name for young adult novel, and a light novel written in English would just be a god damn young adult novel. But by defining light novels by what they as ignorant fans believe them to be, they're attempting to limit the definition of what a light novel can be. And we really shouldn't be limiting a demographical term by anything but the demographic.