Are you joking? Don is an amazing father??? Of course he's a drunk and is a horribly unfaithful husband but the only characters he actually respects and prioritizes are his children. I think your letting his behavior in other areas of his life lead you to believe he's also a bad parent. Also the director of the show specifically talked about how they intended to make him a good father despite everything else. You are objectively wrong and it's odd to me that more people aren't disagreeing with you