Michael C. Hall isn’t two steps through the door before I understand his entire career. On paper, his clean-cut, all-American good looks make him an unlikely choice to play the sexually depraved Emcee in the Broadway hit Cabaret, much less the dysfunctional mortician in HBO’s Six Feet Under, and they make him a downright preposterous choice for the sympathetic serial killer in the current Showtime hit, Dexter. Why, you have to wonder, does he keep getting cast so perversely when his face looks tailor-made to play a Mormon missionary?