Does Partisanship Promote Democracy or Prey on Democracy?

Most agree that partisanship, polarization and politicization are all by-products of political parties; and to some extent human nature.  What remains to agreed upon is whether these by-products strengthen or weaken a democracy? You  have read an article which argues negative partisanship is good for democracy.  Do you agree? Disagree? What is your position?  Does partisanship promote democracy or prey on Democracy?