The Charleston is a fun crowd pleasing dance but in this series particularly it has started to feel repetitive and boring. Incidentally, according to Aliona (and with agreement from Tristan) it is one of the easiest since you can "get away with murder".

I had thought you couldn't fail doing it if you are at least a half-decent dancer in general until Helen's, but I think that is the exception that proves the rule rather than anything else.
One of the problems is that it is done in too similar a way too often. Being so stylized this sticks out more than it might for some other dances. Goofy, gurny, bobbly, cute, with a bit sass. I would like to see more different takes on it like the one Holly and Artem did, or the one Jay and Aliona did. They were more cool and modern with less obvious moves. The two versions in the final were quite similar in some ways (not the styling but the feel) and were not even the best versions over the series. I preferred Kellie's but I didn't think it was a stand-out for her compared to several other dances she did. It was probably Georgia's best one but was still only slightly less forgettable and predictable than all her other dances.
Anyway I do think they are ruining it now (a bit like too much chocolate making you sick) and finishing the series with two in a row was barmy. Either try to limit how often it is done or encourage more creativity and less typical versions like those in the final.