'The Creature Walks Among Us' isn’t consistently great, but I would still classify it as a worthwhile film. In my opinion, this one is certainly stronger than 'Revenge of the Creature', even though there were sections that didn't connect with me quite like others did. The scenes featuring the Gill-man are genuinely well done, particularly later in the movie. However, it seemed the filmmakers focused more on the human characters, and their storyline just wasn’t engaging for me beyond a superficial level; I felt it could have used more of the creature itself. Rex Reason is the only actor who stuck with me even shortly after seeing the film. Leigh Snowden does an adequate job, while Jeff Morrow at least managed to portray his role reasonably well—though I didn't particularly care for his performance. Ricou Browning is the sole member of the main cast to appear in all three installments, naturally as the underwater Gill-man. It’s a better sequel, even if neither film gets anywhere near the quality of the original.

Source on TMDB