There are so many larger than life characters involved in the show, and with all the props and flashy gimmicks, maybe Felicity's performances are at the moment coming over as a little lacklustre.
The foxtrot was fine for a second dance, and I think Vincent must has been working really hard to help Felicity actually remember the steps! She seems to be doing that now, so perhaps they will now begin to work on "selling" the dances if they go any further in the show.
They have only had two dances so far, and not everybody will be able to get everything to click first time.