Nach Baliye doesn't seem to be a hardcore dance competition like Jhalak dikhlaja. Each week we see theme based dances in NB whereas in JDJ it is various forms of dance. In theme based dancing steps could be repeated and expressions are more important to convey the essence of the theme. But in various forms of dance like in JDJ one needs to expertise the concept associated with various dance forms and each form has different step. So basically I think through NB we aren't just voting for the best dancers but also the jodi with best expressions. I don't find anything wrong in here when people vote for jodis which appeal to them. NB is a popularity contest too and that is why we have star couples.
Just my $2đł