I don't mind slicked back hair for Superman as far as just the look (usually), but the logistics of it niggles at me slightly. Are we to assume that in addition to taking the time to put on the suit, he also applies brylcreem to his hair before he saves people? The Christopher Reeve version makes more sense, where the hair is slicked down and neatly combed when he's Clark, only for it to become naturally tussled and unruly in the process of his suiting up and rushing to the scene of the latest drama.