Many people seem to have a favorable opinion of him, for supposedly defending the Roman republic during its collapse, but seeing his history and actions he did everything to defend the interests of the Roman elite to the detriment of the Roman population, and abused the system against their enemies when it was convenient and was a landowner famous for building the buildings in a horrible shape. Still, it has a reputation for having defenders to this day.
People hear "Roman Republic" and get all starry eyed. You're right that he was defending a corrupt and incompetent regime that did nothing for the people of Rome and only existed to allow ever greater debauchery by their ruling elite. But because they used the magical "republic" word people assume it is automatically great. Same way the US state and it's biggest champions have legions of defenders today.