Are the Prequels Even Worth Watching Once?
When you want to examine the creative circumstances of the PT
[to put it mildly]
If you want to find out what went wrong
[to tell the truth]
If you want to find out what George Lucas was thinking when he made the PT
watch the every PT movie with the audio commentary and after that the documentaries that came with the 2-Disc DVD Sets (The Beginning, From Puppets to Pixels, Within a minute).