There's nothing wrong with the game (especially Rome) having 'Great Families' because they did in real life. In Rome there were two classes of people basically (three if you count slaves). There was the noble Patrician class and then there was the Plebeian class. The Patrician class was a small percentage of the population but they held most of the power, especially in the beginning of the Republic. Inside the Patrician class there were certain families that were very old and/or prestigious. You could even have a 'Great Family' like the Julii who were very prestigious but didn't have a lot of power or money left and allied themselves with the Plebeians.
The Plebeians were mostly farmers who worked the land of Patricians. They didn't have many rights at the beginning of the Republic but over time they fought for more and got them. The Tribune of the Plebs was very powerful and had a veto over the Senate if I recall. The Senate was all Patricians I believe. About 300-500 in total. The Plebeians had representation through the Plebeian Council (also known as the Tribal Assembly I think). There were 3 Assemblies.
The Senate and Patrician class were generally conservative though. The conflict between conservatives/Senate and the Plebeians went on for hundreds of years. Roman armies were even defeated in battle because commanders didn't like each other and didn't want to cooperate. This internal political conflict eventually became violent (Gracchi Brothers murdered) for multiple reasons and then the Republic crumbled into pieces. Caesar was a champion of the Plebeians for example.
This is probably the biggest thing that bothers me about the game. They released a game called Imperator Rome but did not even come close to properly modeling and simulating Rome's internal politics and government.
The massive wealth and hordes of slaves that were brought to Rome because of their conquests, eventually completely destabilized the Roman economy and political system. It led to mass unemployment, massive concentration of wealth, 3 slave revolts, 3 or so civil wars, mass imprisonment/executions of citizens, multiple dangerous violent demagogues rising etc. They basically became victims of their own success. Massive problems developed internally and the Roman society/government failed to properly address them which eventually led to disaster. As the Roman Senate and its loyalist forces (Pompey) were defeated in battle by Caesar and his loyal Legions.
A lot of the things that happened in Late Republic Rome have started to happen in the United States recently. It's been written about in the news a lot in recent decades. Rome was the superpower Republic of the ancient world. The United States is the superpower Republic of the modern world. The United States government is in fact partially modeled on the Roman Republic government. There is in fact an ancient concept developed by the Greeks called Anacyclosis which is a cyclical theory of political evolution. John Adams called it the "creed of his life". Cicero also talked about it. And Machiavelli.
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Imperator doesn't model any of this really. The problem with Imperator in general is that the mechanics don't really reflect historical reality. This is a major reason why (especially at release) all nations feel basically the same and the game sort of feels like it's a copy-paste with a Rome skin on it.
For example the way that all major characters in your country want to destroy you and start a civil war because they didn't get a random job doesn't make any sense and is really nonsensical and goofy. People don't try to destroy their country and start a civil war because they were denied a job offer lol.
Also FYI Roman dictatorship wasn't a technology invented in someone's shed lol. It was an actual political office that was invoked in times of emergency and then eventually was established by force. Paradox should hire historians like Mike Duncan from The History of Rome podcast to consult with. Or just read Wikipedia more lol.