As an Italian, I can assure you that the structure of our government is good, the Constitution is top-notch, and the whole system is a masterpiece of art.
Unfortunately, the entire thing is plagued by politicians, so it is falling apart.
Of course it may be, but after studying other types of government I am still convinced that ours is quite good.
My point is that no matter how good a government is, at the end of the day it is run by people, and people are not perfect.