I think Boyd van Hoeij is very generous when he calls this "a cinematic curiosity". This film is one monstrous void and no matter how hard you try to find something in it, every attempt ends only in disgruntlement.
Bathory horrendously fails in absolutely every respect, and thus having nothing to praise I am left with no option but to list some of its numberless flaws.
There is no visible effort to as much as suggest historical accuracy; the film is infested by countless historical deformations, like Caravaggio's presence and some fascinating mechanical inventions we don't know even nowadays.
Those ridiculous attempts for battle scenes are just the tinsel supposed to form an illusion of grandeur - but nobody really cares about them for two reasons, first, they are so miserably theatrical; second, they are not a part of the main plot line as Jakubisko appears to have added them there just to show that he can imitate Hollywood movies.
There is no psychological portrayal of any of the characters, Bathory in particular is tragically laboured, displaying her internal conflicts with acting performance inferior to soap-operas (yes, it is possible to sink so low).
Finally, the visuals deserve a word, too. Jakubisko's aesthetics appears to consist of one maxim: the more smoke in the picture, the greater artistry. Almost each and every shot is veiled with dust, smoke, vapour or mist. Probably it is supposed to cover the omnipresent disappointment.