The analogy between Trump and Berlusconi is obvious; both are boastful businessmen with colorful pasts and strong media connections who insisted that they could cut through the mediocre politics of the day to get their respective nations going again. While Trump is, as far as I can tell, unlikely to engage in bunga bunga parties at the White House, the most significant differences between the two pertain more to the two political systems than to their personalities; as the directly elected President of the strongest nation in the world, Trump would have the ability to influence world events much more strongly than the Prime Minister of Italy ever could.
Berlusconi was, of course, a complete disaster as Prime Minister, so the next time someone tells you that Trump can turn America around with his vast business acumen, an appropriate response would be, “Just like Berlusconi?”