All in all I think Edge of Tomorrow was a great movie, and stands on its own merits. And Vrataski being British? Bah, as if you've never heard of the Coopers
Kapoors and the Robinsons
Rabindranaths who're as British as they come.
Have seen some bits of the manga. Manga Rita is small and cute and tsurupettan and all sorts of moe. Movie Rita is tall, ripped, nowhere near moe, and actually looks like a hardened badass. I approve.
Also, Cage's uniform threw me for a loop, until I realised it was a WW2 style US Army uniform. Which I thought was an interesting touch.