I enjoyed Gransazer very much! I think Toho created a much cooler version of the Super Sentai Series (with Saint Seiya mixed in) than any of Toei's more recent offerings. The hero designs by Toho/Godzilla veteran Shinji Nishikawa (who also did the manga adaptation!) were impressive, as were the transformations! The giant robots, designed by Fuyuki Shinada, are just as impressive.
SPFX director Kouichi Kawakita has come a long way from his mixed work on the VS Godzilla Series (on which the Millennium Series improved upon). He's really improved himself in Gransazer! The giant robot and mecha work (mecha is Kawakita's trademark), as well as the miniature effects, are quite breathtaking. Kawakita has really outdone himself. He's getting better and better.
And the acting . . . Let's just say, these "pretty boy/pretty girl" actors are no wimps! I was very impressed by the actors/actresses used for this show.
It's a shame that this series is being Power Rangerized, er, "localized" for Zodiak Guardians, because this is one of the better Japanese superhero shows worthy of being seen in the US as is. Gransazer is a solid winner!