It worked great for the last several hundred years. The problem is that as government keeps expanding to control more and more of our lives, every decision it makes it necessarily imposes on everyone, whether they agree with that decision or not.

E.g. In a country of 100M people, if 60% agree with a bill and it becomes law, the country has imposed that law on 40M people against their will. That's just as true in a dictatorship as it is in a democracy. The more areas of our lives government involves itself in, the bigger this problem becomes.