1. Usually better not to translate directly, but to incorporate the idea in other ways
Used to emphasize the severity of something, or recognize the great lengths someone went to
あれだけカッコつけといて・・・。 // そなたらがあれだけの力を秘めているとはな・・・。 // いや、当然だ。あれだけのことを僕はしてしまったんだから・・・
Put on a real show, didn't you? // I'd no idea there was such strength in you. // No. You were well within your rights, after all I've done.
Final Fantasy 4 DS