I love anime adpatation into live action film but I have to admit that for Gintama I'm kinda confused... Oguri Shun is a great actor, he can play all types of role but... well I'll wait to see that.
Japanese adaptation are better year by year ( Death Note or Ranma 1/2 even if the manga is of course better or Shingenki no Kyoujin which have good critics or Assassination Classroom (1) that I saw recently and which is, I think, very good) so I'm pretty excited. I know Yamada Ryosuke only with Assassination Classroom so I don't know what he can do but I'm confident even if Full Metal Alchemist could be hard to adapt.