With gerrymandering (which will only get worse with the Census data) and shrill partisanship, it's broken.
Congress fails to represent the voters.
What Happens When Congress Fails to Do Its Job? - Newsweek.com:
"What drove Bayh from office, rather, was that he'd grown to hate his job. Congress, he wrote in a New York Times op-ed, is 'stuck in an endless cycle of recrimination and revenge. The minority seeks to frustrate the majority, and when the majority is displaced it returns the favor. Power is constantly sought through the use of means which render its effective use, once acquired, impossible.'"