In the US context there are many flaws.
First politicians take money from special interest groups, lobbyist and wealthy private individuals. They do not have to disclose who these groups are.
Then they say what people like to hear so that they can get elected. After that it is pay back time to these lobbyist as special groups even if they do not serve the interest of the general public. This is legalized bribery. My recommendations is that there should be a common pool of fund for all politicians to level the platform. They should disclose who are the contributors, if any.
The other problem is that all politicians do not have equal visibility to the public. Those who have more money can drown out others with better messages and policies. My recommendation will prevent this.
Another problem is that people don't take the time to study issues.
People need good independent information on the candidates and their agendas. Everyone who has to vote, needs to be aware of history, economics, social issues, current affairs and other geo-political issues to some extent. Many still vote irresponsibly on factors such as candidate's appearance, eloquence, race, sex and other irrelevant factors.