I don't see this being well received in the West but I'll picking up a copy regardless as I love co-op games.
Neither do I, but its a good game. It can pass off as a hack and slash type game for people who enjoy hack and slash games, and will somewhat appeal to ragnarok online players...hopefuly.
I have mixed emotions on co-op. On one side its fun if everyone knows what their doing but most times, its everyone for him/herself