The final years of the Republic were characterized by fights over citizenship for the Italians, consolidation of land in the hands of a small number of slave-owning oligarchs, meaning that more and more people were unemployed and ineligible for political advancement, and politicians breaking the political rules to push their agenda (kick out the guy vetoing my popular bill) or halt someone else's (kill the guy who passed that popular bill).
The exciting part of the fall of the republic that all the plays and history books are written about, with the civil wars and the dictators for life and the "friends, Romans, countrymen", that was all enabled by the earlier boring but highly consequential political fighting and norm-breaking.
Oh, and this was totally recognized at the time. Sulla tried to address these problems directly with his constitutional reforms, but it was too little to late. Later politicians like Cato and Cicero tried to re-normalize democratic behavior, but failed because their opposition had learned how much profit there was in abusing the system.