If, no matter who we "elect", we get the same policies, then I do think it's productive to highlight this via comparing and contrasting the parties/representatives.

This shows very strong common threads running through two parties which are presented to us as drastically different. That, in turn, exposes the fact that there is another "power" that completely supercedes our democratic process and the very notion that we actually have a representative form of government.

Now, what we do with that information is another story. Talk raises awareness, but it's not enough to just talk about it. There needs to be a viable third party and protests aimed solely and specifically at reform such as removing the money from politics, term limits, closing the revolving door between industry and government, etc.