When people talk about democracies, it's common to think of the US Constitution as the ``defining point of democracy''. While the US is the first modern democracy, its laws is far from perfect. In fact, it may be one of the worst of modern time! I will briefly go through the following.
A near-ideal democracy would have a roughly linear positive correlation between the fraction of voters who support a policy and the possibility of the policy being passed in the legislature. But in the US, the line is flat at about 30%. A representative democracy wouldn't have a perfect correlation, because the general public is unable to be informed on all topics; fluctuations are normal. But a flat line means that the opinions of the people don't matter at all. This does not make sense in any type of democracy.