I think some of these reviewers are a bit nervous about some of what the themes in this movie may come across as. Free men standing against impossible odds fighting for freedom. Refusing to lie down and accept slavery. Killing their oppressors rather than trying to "compromise".
Very "unPC" and the kind of thing Hollywood really doesn't like getting out into the population unscathed.
I, for one, can hardly wait to see it.
The negative reviews by the liberal media is because this movie is about brave warriors of the West standing against the hoards of rich Persians to defend themselves and their country --- all while soft liberals and turncoats aid the Persians for their self-interests.
The liberal reviewers can't stand it because history is repeating itself.