Hitler wasn’t bad if you rate rabble rousing as great oratory (I don’t mean what he said, I mean the power his words had to move or influence people).
In recent years there have been a few with choice phrases (like Dennis Healey for example) but Clinton isn’t in the category of ‘great orator’ I don’t think. He is and was as Pres a great communicator with a very easy manner with all types of people. But that’s a different gift.
Maybe someone with Irish Sky can tell us if any of their lot are good orators? They certainly talk the hind legs off several thousand donkeys.