Now admittedly I've only seen a couple of other episodes so far of Season 3 but if Saturdays was one of the best then I really dread to think what the others have been like.
I found Saturdays episode very dull and pretty much a carbon copy of the episode with the black hole in Season 2 in several places. I certainly didn't feel it 'gave' anything to the Who-mythology or was actually entertaining. It did have a few highlights but they basically involved Martha's mother.
Anyway, hope I disagree with the others who liked it by liking all the episodes they apparently didn't!