They are like any other horse, honestly, there isn't an answer to this question. Their personalities vary so much.
I've owned quite a few paints. The mare I have now is sweet and gentle. And then she'll be the biggest PITA, blonde, ditzy, dork.
I had a paint gelding from 2 years til he was 8 years, and he was the calmest horse we've ever owned. Even at 2. He acted like he was 30. We regret selling him.
Another mare I owned for 5 years, she was born here, there was always something "off" with her. She was a PITA as well.
Could also be a mare thing.
Our geldings have all been great horses. Mares on the other hand are...a PITA.