It absolutely got better at four for us - and our friends. I think it comes down to better impulse control and self regulation. That said, the kids who were the drama, tantrum kids at three are probably going to always have that kind of personality. It just becomes more manageable at 4 and beyond. In our case, son was never any emotional trouble at 3 (never cried, tantrum, argue, get mad) but was physically challenging (running ahead in the street, hitting, just always physical and not listening). He's waaaayyyy better at 4 but he's clearly always going to be a busy, physical kid. Now he just understands the rules better. Point of the story is just analogy: that a tantrum 3-year old is going to be better behaved at 4 because they have better impulse control and understand expectations. But that doesn't mean that they don't still have the angry tantrum feelings inside of them.