I never found appeal in American crimes for some reason....they're not as appealing to think about as theatrical pieces. The main themes I think about when (North) American come to mind are cursing, racism, crude violence, and really sick, perverted people. That's probably very stereotypical, but hey, I get fed all this from the media.
When I think about organized crime in other cultures, i.e.Chinese, Indian, Italian (Godfather anyone? =P) , it seems more mysterious and interesting. That's why I cringed at the idea of the remake....but I might see it sometime later.
I don't know why everyone hated the second Infernal Affairs--it was my favourite, despite my hatred for Edison Chen lol, but he didn't show up THAT much...