A B movie or B film is a low-budget commercial motion picture that is not an arthouse film. In its original usage, during the Golden Age of Hollywood, the term more precisely identified films intended for distribution as the less-publicized bottom half of a double feature (akin to B-sides for recorded music). Although the U.S. production of movies intended as second features largely ceased by the end of the 1950s, the term B movie continues to be used in its broader sense to this day. In its post-Golden Age usage, there is ambiguity on both sides of the definition: on the one hand, the primary interest of many inexpensive exploitation films is prurient; on the other, many B movies display a high degree of craft and aesthetic ingenuity.
I’ve noticed as a result independent B-movies that feature werewolves tend to be more competently filmed, tighter scripted affairs (Think Ginger Snaps).
Considering this was directed by a guy whose only film at the time was Piranha II: The Spawning. It seems like a miracle.