Piranha stands out as a wonderfully flawed 70s monster movie—so poorly made that it becomes entertaining and offers an enjoyable experience if you’re prepared for pure camp. It embodies the spirit of 70s/80s creature features, delivering everything one might hope for: villainous military figures, predictable lakeside parties, disastrous scientific experiments, dreadful lines, cheap-looking special effects, and much more. The film's debt to Jaws is undeniable, evident in elements like the town disregarding warnings about a dangerous aquatic threat, a strikingly similar movie poster, among other things. Steven Spielberg himself has acknowledged it as his preferred imitation of Jaws. This inexpensive production captured the essence of creature horror filmmaking during that era, demonstrating a refusal to be held back by limitations in effects, acting quality, or budget. Later versions from the 2000s seemed primarily interested in incorporating excessive nudity, although Piranha (1978) does include some—though far less than those later films. The original film prioritizes showcasing hordes of ravenous fish attacking their unfortunate victims. This amusing little movie helped establish director Joe Dante’s career, who would subsequently team up with Steven Spielberg to create Gremlins—a truly impressive creature film! While Piranha doesn't reach the heights of Gremlins, it provides a diverting introduction to Dante’s world of bizarre creatures.

Source on TMDB