 Reviewers also compared Firefly to Whedon 's other series , Buffy the Vampire Slayer . Chocano noted that the series lacks the psychological tension of Buffy , and suggests that this might be attributable to the episodes being aired out of order . MSN , on the other hand , pointed out that after viewing the DVD boxed set it was easy to see why the program had attracted many die @-@ hard fans . " All of Whedon 's fingerprints are there : the witty dialogue , the quirky premises and dark exploration of human fallacy that made Buffy brilliant found their way to this space drama " . 
