The Great Dictator isn't awful, just painfully unfunny.
Then why is there so much laughter whenever I've watched it? Explain!
Funny is subjective, you know that. We've also had this discussion a few different times, and my feelings remain the same, The Great Dictator is just like every other Chaplin talkie, painfully unfunny with jokes that never hit, that's as much of an explanation as you'll get this time around.