Train to Busan (DIR. Yeon Sang-ho) Sometimes, a film fails at everything – an abject failure.  Sometimes, a film fails at the majority of its goals while succeeding in some, earning a designation of mediocrity.  Then, there are the rare cases of films failing in a majority of ways with a few successes, wherein those successes manage to outshine the failure.  Yeon Sang-ho’s Train to Busan fits into that final example, a film that comes…