In practice, what are the dangers and inefficiencies when party unity and partisanship cause Congress to become deadlocked and unable to agree upon action?

According to your text, the intention of the framers of our Constitution was for the members of Congress to act in a spirit of compromise. In this way, resulting legislation would reflect the interests of the many rather than those of a particular faction. In practice, what are the dangers and inefficiencies when party unity and partisanship cause Congress to become deadlocked and unable to agree upon action?