moviefreakedmind said:

No, I'm confused as to whether you think that the original line was delivered too angrily or not. You seem to imply that the original line was delivered angrily, which I guess it was, but no more angrily than any other Vader line in the series (like "I find your lack of faith disturbing")

All other lines were delivered without any anger... with a sole exception "Tear this ship apart".

And this the best example of Vader... cool, intelligent, witty, sarcastic.

Of course this is speaking in general. As for why anger ESPECIALLY does not fit in that particular section of the film, please refer to this post and this post.