Awesome
Granted,we have moved beyond the f\x of the early 60's,yet there is something more here still:
-the dynamation is and remains effective today perhaps because it has a "certain-soulishness"which films lack today(painstaking art & craft of a Ray Harryhausen)
-English actors do well in period pieces(they appear comfortable in silly costumes)
-the music of Bernie Herrmann is extraordinary & timeless
-the visuals of exotic locations appear authentic and "feel"right
-pacing is superb
-Medea played by a lovely Nancy Kovak & Hera by a fetching Honor Blackman(pre-Pussy Galore !)
-wonderful character actors:Nigel Green,Pat Troughton and L.Naismith
-etc(fill-in the blanks,dear reader....)