i agree, i have watched both the documentries as i have the dvd (part 2 is on itv next week) and whilst i like the show, the dvd shows what truly fantastic musicians and dancers the main cast are. hopefully if its not picked up for a second series then the cast go on to do some other good jobs, (i especially love georgina hagen - lauren, and mathew - jez, plus mitch is an incredible dancer)
make sure you watch next weeks documentry as its really good, i would also recommend the dvd even if you have watched the docu, as watching the episodes again after the documentry gives a much better appreciation of the show.
my personal view is it is the scripts/story that have let the show down, not the actors/dancing/music/choreography etc