I don't know, it's horses for courses, I think. I don't think that the way they do it in the US would work over here, just as our format wouldn't work over there.
They have a bigger pool of stars to choose from, celebrities tend to be less inhibited, they also have far wider dance experience than our celebs and there have been some total ringers on DWTS. Americans don't tend to have the embarassment at showing off gene that Brits do and so can go for it far more comfortably than we can.
I like watching DWTS but I wouldn't like it to be my Saturday night main show.