I hate to be the wet blanket here, but I've never been crazy about Atragon. Toho cranked this out awfully fast, and it kinda shows, I think. Manda's just another Tanaka-mandated kaiju, and isn't very well done (the shot of him slinking back to the cave after being zapped by the Gotengo is particularly poor).
And I've never been crazy about the Gotengo's design, either. It just looks like a cigar with fins on the back and a drill head on the front - pffftt. Just doesn't stack up to other Toho mecha.
True, Jun Tazaki is good in it. But I wish his chance to shine had been in a better movie.
It's not awful, by any means. But compared to other Toho non-kaiju SF flicks like Battle in Outer Space or Gorath, Atragon is my least favorite. Still worth picking up the very nice Media Blasters DVD, however!