I agree too. When you go to a play or a musical, the audience don't interrupt the perfomers mid-way through a speech or song, so why does the Strictly audience behave so rudely? I love Andrea's voice and it would have been nice to hear it properly.
Having said that, I wouldn't have minded if their noise had drowned out 'The Wanted'. They all sounded like someone had grabbed hold of their testicles and squeezed really hard.