Using this definition from wikipedia:
I can tell you that liberal democracy is EVIL.
Separation of powers? Evil.
A single point of authority often rightly motivates.
Independent judiciary? Evil.
Authority flows downhill, naturally. That means, from God, to the leader of a nation, to the judiciary.
Checks and balances? Evil.
There is NO system which incorporates only humans that can prevent humans from being wicked, because such a system is inherently flawed.
. . . between Different branches of government? A government should not be so divided that cannot maintain excellency in the things that it does. A government should only focus on doing that which it has the responsibility to do, and that is ONLY to build and maintain infrastructure, and to enforce criminal justice and protect the rights of its citizens. Also, and only in short term emergencies, it may provide aid to those in need, but it should not try to take care of people from cradle to grave.
Now, that being said, those responsibilities do not normally overlap, and thus, such as "checks and balances" system would be unnecessary, because deviating from their assigned duties would be 1) irresponsible and 2) unnecessary, and 3) beyond the scope of their responsibilities.
Democracy is evil, because the majority is evil, according to Jesus.