Piranha, an undisguised Jaws ripoff from the late ‘70s, is no match for the Spielberg’s blockbuster phenomenon (which makes a cameo appearance as a video game). This Roger Corman creature feature, helmed by Joe Dante (of Gremlins fame) is nonetheless a surprisingly good B-movie. It contains all the B-movie trappings: skinny dipping teenagers, unconvincing special…