Russian: American kids running around using Google Translate to scare people. Or maybe back when AD was ran by a Russian player... (koya wasn't it?)
Pole: Polska Crev, the meanest bunch of meanies in the game, or so I hear. I've never met any of them in game, but I bet they're good guys if you don't look threatening.
I also hear Brazilians are bad, but that was again probably a bunch of American kids playing pranks.
edit:
Belliaum wrote:I have been playing since World 5 but I never played a full world since I always either get killed by other players or a nasty animal eats me.

Why give up, though? I can see getting bored and that being the last straw, but you hopefully have a base to come back to and you do get some of your stats back if you inherit.
Opinions expressed in this statement are the authors alone and in no way reflect on the game development values of the actual developers.