Well, in theory the best dancers should win, but it rarely is. Normally the best dancer is the one who has done professional training and that often sees them loose the public who want to see the celebs go on a “journey” and improve rather than being consistently good. Celebs like Ashley Roberts, Alexandra Burke, the guy from JLS, Very good dancers, never had fundamentally bad weeks, but also never got the viewers behind them as a result, so they didn’t win. It’s an entertainment show at heart and viewers vote for who they like and are entertained by, especially up until Blackpool. Hence why the likes of Ed Balls, Kate Silverton and Ruth Langsford all lasted as long as they did, viewers liked them as indivudials and we’re entertained by them.