Caesar was a threat to the Senates financial interests, just as the Senate was a threat to Caesar’s financial interests. Calling either of them corrupt would be accurate, referring to only one party as corrupt would be revisionist.
My sympathy is for a Representative form of government. The Senate was far more Representative than Caesar. The precedent that Caesar set led to Czars, Kaisers and Kings claiming absolute one man rule for the next thousand years. Good thing our founders were more inspired by the ideals of a Republic than those of a Tyrant.
Our framers realized that there was a need for separation of powers; they took their cues from the Roman imperial period, during which time Rome was just as much a republic as before, if not moreso.