It's hard to say what Kratos could be racially since he contrasts with the lighter-toned Zeus. Even the original designs for Kratos had him looking more African as if he were a warrior from the continent.
I say let it rely on acting ability. Out of all the beefed up action-stars, Djimon is obviously the best actor.
Yeah, this would probably be best... and like you said, the original GOW director wanted Djimon to play Kratos in a would be God Of War movie.... This Djimon guy doesn't look a bit like Kratos though
Acting ability is needed but so is resemblence....
The only one I can think on which most people might agree on is The Rock....