I think people are overstating the quality of previous casts, this is a typical Strictly cast imo just without a big name to boost it, not that it matters as they normally get voted out very early anyway. It's quite similar to Series 8's cast imo, with a slightly weaker male half, and that of I'm not mistaken was the highest rated series.
Great rating for the launch show, up 0.4m on last year. I see the Daily Mail have decided to stick the boot in, another sign of its success.