Historically and mythologically inaccurate leaving nothing but a few (at least sufficiently subtle) references to the title giving king.
Ugly colors and endless confusing fight scenes among artificial fog and inconsistent weather conditions.
The proposed fight for freedom (in the completely unfree steetting of late antiquity) and the disgusting war-is-worth-it-if-you-win morals make this movie unbearable to an extent not even Keira Knightley's pretty face and Hans Zimmer's score can save.