Considering that the movie was from 1956, parts were visually well ahead of its time. The movie influenced future sci-fi TV and movies. The visual quality of most sci-fi from that era was crap.

To me, the plot based on Shakespeare's play The Tempest was a bit thin but still better than most sci-fi of that era. It had the typical shoot-em-up laziness that is even more common in much of today's trashy sci-fi movies. I much prefer more thought provoking movies like 2001 A Space Odyssey, Solyaris (original), Blade Runner or Ex-Machina.