I'm starting to think Zacky Snyder is just not a very happy person, his movies are all so colorless, and joyless, and even when he adapts something as fun and colorful as a character like Superman tends to be, he takes all of that out.
I've said earlier that his first movie 'Dawn of the Dead' is still his best. It doesn't suffer from color desaturation and an overabundance of slo-mo. Even '300' is relatively gimmick free. It's only starting with 'Watchmen' that the slo-mo and color desaturation really take hold. Then it becomes his trademark after that.