The reviews seem pretty split. Last I checked, regular critics are hating it but fans of the comics are loving it, as well as mainstream audiences. Rotten Tomatoes has the critic score at around 35% but the audience score there says around 80% last I checked.
And of course Snyder’s fanboys claim Disney/Marvel is paying all the critics to bash it, but that’s total BS. If anything, WB is paying them to get all the bad reviews so people will hear about and see it for themselves. I’ve seen lots of people on Twitter saying that they had no interest in the movie until the critics started bashing it.