As far as I can tell, there are basically two kinds of Charleston: you've got your cool, sophisticated flapper dance, all laid-back and down-played, Josephine Baker in a bad mood kind of Charleston; or you've got your Bugsy Malone, custard-pie in yer gob Charleston, all larky and playing bongos on your bum while gurning wildly (Ola Jordan, I'm looking at you).
The only Charleston that could have competed with Susannah and Kevin's gloriously OTT Paso would have been the latter sort and, unfortunately (or fortunately, depending on your viewpoint), Artem is incapable of choreographing that kind of Charleston.
Poor Natalie. She's damned if you does and damned if she doesn't, with the same posters who criticised her good dancing because SHE IS A DIRTY RINGAH now criticising her because they think she didn't do such a great dance. Heigh-ho.