Earth-Like? If I saw something from Oddworld walking around on Earth, I'd be freaked out.
Anyway, even if some of the designs are a bit anthropomorphic, they have their own touch of Oddness that makes them great. And plus, we haven't even heard the voices and got a feel of their personalities. That's another big part of character that can make a huge difference. Remember Vykkers?
-oddguy
