Of course it is. No system of government is perfect, but of course overall I think a Democracy is best.
In a dictatorship people grab for power by use of military coups, assassating the leader or other other methods.
In a democracy the opinions of the masses are the key to power so character assassination, lies and deliberate misleads because the rule of thumb.
The only way to offset the latter problem is for the people to be aware of this and to keep themselves well informed. Unfortunately in the US the people do a horrible job of that.
This is why I'm a huge fan of organizations like factcheck.org. They call out both sides on their BS.