I can report the same thing, Steam downloads a 9GB file... not quite sure what to think... seems like its being reported by others all over the net.
Apparently Steam doesn't distribute patches, they instead distribute already patched game files... which in this case includes a 9GB file.
So yes, every time there is a 1MB change to the 9GB pack0.dzip data file, we get to redownload 9GB.
yep. there were other games that had to do this as well. some companies did come up with solution though, which was the separate the patched files into small folders that sat outside of the main pack. but because of the compromise in file structure and resource placement, the game performed considerably slower. these are things steam would wish to keep a secret.