After one understands the two purposes of government, one then has a basis for evaluating how well human government is submitted to those purposes.
To review, the two purposes of government are to (a) punish those who do evil, and (b) praise those who do good.
There are two parts to look at in every law: the action of those governed, and the governments reaction to it.
The first question: Is the action of those governed good or evil?
The second question: Is the reaction of the government to praise or to punish?
Fundamentally, it's really that simple. Some examples: