I think I've soiled myself! The guy dancing in the black vest is brilliant!!
They're right about the cliche ridden script, but I've no doubt it was deliberate. Comic book stuff along the lines of Sin City. CGI blood everywhere. Techno soundtrack for the battle scenes. I loved it.
As for Butler's accent, I don't think I've ever heard anyone put on a Greek accent in a Greek mythology movie. If Michael Caine had played the part, King Leonidas would've been a cockney.