Poor quality video output from iMovie 08

I have tried to save or export videos on several occasions, their output quality is always very poor.
Recently, I needed to translate videos from MPG, MOV, AVI etc.. using various translation tools. I am not sure how much quality I lost during those translations (I wish iMovie would import something, anything!).
I have saved my projects and also tried exporting to the highest resolution in both cases. When playing back within PowerPoint or QuickTime (7pro or 10) the quality is so bad I almost can't recognize the people in the video.
Does iMovie 09 do a better job with output or am I just using the wrong tool?
Thanks in advance.

not sure if i'm having the same issue or not, but i'm having problems with iMovie 08, and exporting my finished project, and having the frame rate be goood, or the resolution stay good, or both. I've tried m4v, avi, mpeg4 and they worked in quality in that order, but m4v still didn't have as good as resolution as the original file. Is there an option that automatically goes with original framerate, and resolution? What should I be doing for best visual quality in general?

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