The dialogue in this thing could only have been written in the late 70s. It is a mixture of pure stupidity, misogynist tripe, and simpleton plot driving gibberish. My theory is that every one in the 70s was either so coked up or could not hear over the crunching of the lead based paint chips to really pay attention to what they were saying to each other.
Aside from that, film scores suffered from a similar malaise. If they were not rock opera disco jams, then they were the banjo picking symphonic equivalent of wall to wall shag carpeting. Rarely did the music enhance the mood or theme of the action, most of the time it was just loud and full of crumbs. GRIZZLY is no exception. In fact, the foot chases where man goes after bear are meant to capture the light hearted whimsy of similar scenes in JAWS, where the boat bounces along in full hunter fisherman glee.
What does this movie do right? Brutality. A lot of people die. Most of them main characters. In fact, aside from the park ranger who decides to strip to her underwear to put her feet in the creek, most of the victims have actual lines of dialogue. Still see above about that significance. A horse is decapitated, humans are dismembered (including a KID!) and at least one lady is pinponged against some trees while her whole hippy camp friends watch. The effects are good only that they are quick and the camera does not let the audience focus on the cheapness of them.
Overall, Good Movie.