Accomplished but full of drawbacks, divisive to the point that recommending it becomes a grey area. Man of Steel is either good enough in some graphic visual aspects to elevate it beyond its shortcomings, or a gloomy disappointment that contrasts against high expectations. Zack Snyder (“Dawn of the Dead,” “300”), is the grim and grime-heavy director, so controversial a choice at the helm. At best, he comes up with astounding theatrical concepts and a twisted spin on the DC Comic legend, once a beloved character. Superman now is moody and troubled, with a “Dark Knight” kind of treatment.