It's a bit up and down, but all in all 'The Creature Walks Among Us' is a film I'd consider as 'good'.
It, for me, definitively improves upon predecessor 'Revenge of the Creature', despite a few parts I didn't like as much as other bits. The stuff with the Gill-man is actually really good, especially towards the end. Despite that, the filmmakers seemed to prefer showing the humans - whose story didn't interest me on anything other than a base level. It needed more creature, in short.
Rex Reason is the only cast member I immediately remember, even minutes after watching. Leigh Snowden is serviceable, while Jeff Morrow at least plays his sorta character well enough - given I disliked him. Ricou Browning is the only main cast member to appear in all three times; as underwater Gill-man, of course.
The better sequel, though neither come all that close to the fab original.