An ideal government in an ideal world would be one in which all of the leaders made all of their decisions based on what was the best thing for the entire country, not what was most likely to increase their own wealth and power.
In an ideal government, all of the governed would take an active role in choosing leaders and communicating with them.
An ideal government would only pass those laws that would protect individual freedom from the government itself and from the rest of society.
The ideal government would be a whole lot less expensive, and would meddle in individual affairs much less, than the government we have in the USA.
And the one we have is one of the best. Imagine what it would be like to live under one of the worst.