GORGO is hardly a perfect film but it does have several things working in its favor which make it more entertaining than many other giant monster films. One is director Eugene Lourie, certainly no stranger to giant monster films directing THE BEAST FROM 20000 FATHOMS, THE COLOSSUS OF NEW YORK, THE GIANT BEHEMOTH as well as GORGO. In terms of Special FX and Ending, only the first film named above is better than GORGO. The FX work(done by Tom Howard) in GORGO is truly well-accomplished and for the time and era was rather ground breaking. The Ending is also truly unique amongst giant monster films which usually all end the same way but this one certainly doesn't.
The problems lie mostly with lack of character development and some serious leaps of logic. Still there are times this film can be quite suspenseful particularly once Mama Gorgo comes on the scene. The huge red-eyed Mama rising out of the water is certainly memorable stuff.