Interesting. My take on the problems with the US system of government (as a non-US citizen who lived there for a few years) is slightly different. When it was setup the US government seemed to be an incredibly well designed system: it could cope with the poor communications and for the first time in a modern democracy power really did rest in the hands of the people and not the aristocracy and those commoners of whom they approved.
The problem as I see it is that the US governmental system is far, far too rigid and impossible to change to adapt to modern realities e.g. there is no need for a college of electors with modern communications, you no longer need a well regulated militia to defend against invasion etc. However updating archaic rules like that requires so much support from everywhere that it is all but impossible and things like the constitution are used by large corporations with armies of lawyers to overturn laws which they don't like. The result is a government which is frustrated in its ability to do what it thinks is needed and a people who are frustrated by their government's inability to do what is needed.
I think this is one of the perils of being first: they did not know that the system would work so they put lots of safeguards and protections into the system to stop mob rule which make the system too inflexible. Once we knew that the will of the people tended to be more tempered and did not result in chaotic mob rule governing systems, such as those in Europe, which were flexible enough to change could bring onboard the parts of the US system which work without importing the inflexibility. Not that they are without their own flaws but, when those flaws get large enough, there is the potential for self reform which the US, in practical terms, lacks.