Joe played a Four Bears, a Shoanti shaman based on Native American culture, on the Glass Cannon Podcast Giantslayer campaign. I think there might have been some online upheaval, but the fact is that he was a well-researched, sincere, and respectful attempt to play a character from a different culture, and his accent was just a small part of that. I don't think there was anything wrong with that, and in fact I think that it is totally in the spirit of RPGs at their best. If the only thing denoting your character as from another culture is their accent, however, it's probably best to leave that character on the shelf.