Watch this, and prepare to be impressed:
The video's creator,
bloodrunsclear, is "an aspiring screenwriter/editor who dreams of one day putting the same kind of attention to detail and consideration into fantasy and science fiction films as award winners put into their dramas. I make fake trailers to satisfy somewhat my desire to see these films made, and made well."
Bloodrunsclear used footage from many different films for this trailer, which are listed in the video's description at YouTube. He or she's obviously a fan of the show. He or she even uses the sword-slash-flash from the series! (For example, starting at 1:19.)
I'm still not in favor of a live-action version of Samurai Jack. But I gotta admit this video makes the idea look a little more appealing.