Again, I'm not saying there's no plagiarism. Having read neither Hunger Games nor Battle Royale (though I've seen the BR movie), I'm not going to take a position on whether there is any. But the evidence you're citing is poor.
I can't tell whether you're citing the case of Таня Гроттер as a funny counterpoint, or as a complaint that the west has ordained itself as the sole arbiter of what gets to be considered plagiarism. Either way, it's diluting your BR/HG argument in the eyes of those you're trying to persuade.
Edited by ardgedee - 10/21/12 at 4:44pm