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Whilst Japanese by origin, Gatchaman borrows a lot more from US superheroes to the degree that a live action film shouldn't be as butchered as some other Japanese properties that are heavily reliant on their nation for characters and plot that don't work outside anime. Since it also takes itself rather seriously given the heavy subject matter often dealt with, they don't have to worry about humour and quirkyness not translating from ink drawings to live performances too.
Well if live action isn't your style, you may be happier to hear that someone has recently uploaded subbed versions of Gatchaman II and Gatchaman Fighter to Youtube. They've been on there for a while without subs but if like me, you're not particularly familiar with the lingo, these could suit you better.