I enjoyed this movie quite a bit, despite the appalling Ms. Stewart. Watching it at home last night with my GF, we both loved certain aspects of the film, and Stewart's D- acting couldn't derail the whole experience. I did on several occasions utter, "I wish she would just shut her mouth." Even when she wasn't speaking, she had that ugly, slack-jawed, open-lipped thing going on. "Please, just shut your mouth!"
Charlize Theron was terrific: frightening yet pitiable. Sam Spruell was very effective. Set design was amazing. Exterior shots were generally very pleasing and often imaginative. Hemsworth was capable, as was Sam Claflin. The special effects were pretty well done. The dwarves were memorable. Most of the featured characters were believable--except of course for Snow White.
Excluding the possibility of a simple loss of objectivity due to the affair going on, perhaps the casting was intentional to make the Snow White character less noble and appealing in order to increase appreciation or at least sympathy for the Queen. I was far more engaged with the Queen than the Princess. Despite Snow White's victimization and innocence, she was a dull, unattractive, petulant, and weird character. Her body language (facial expressions, posture, movement) was awkward and unappealing. Her speech was disjointed, stumbling, and unconvincing. Her emotions were jumbled, her decisions were slow and obtuse, and her leadership was dubious. All this made for a very unappealing character, which drove me to appreciate the Queen more and to feel the match between the drunken and damaged Huntsman and the catatonic and damaged Snow White was much better than the romantic notion of Snow White and Prince Charming (William). That dude got lucky that he wasn't her True Love, eh?
Or, they just screwed up by hiring Stewart.