painting with a pretty broad brush there, but I agree no country today resembles ancient greece, but why would it? You are romanticizing an idea that only existed, if at all, for a very short period of time, kind of like when people romanticize the idea of 'returning to when america was great', it was literally like less than a generation when their family was doing well while forgetting the hardships or the hardships being too abstracted from us now.
If you dont think there was political turmoil or people making political power plays in ancient greece, I got some real estate to sell you. In fact our democracy evolved to offer protections against the ruthless utilitarianism of majority rules, and the hegemony almost by definition it creates, with pure utilitarianism lending itself more to our understanding of fascism, of national socialists, a group of like people dominating people that are different. The individual is meaningless, only the hegemony matters.
Rural areas for example must have a representative structure to ever be considered in the 'greater good', they would simply be drowned out by pure majority rules democracies. The problem in America is that the representative structure has been manipulated for political power, concentrating power into rural/unpopulated areas and away from the actual population, They (the parties, particularly the republican party) have exploited the representative nature of our government by redrawing the lines to push as many voters as possibly into as few districts as possible, diluting the people's voice , and allowing people representing basically nobody make all the decisions.