Do you think of him as a good man, Puppy? And do his apologies irritate you, or mean little? How do you deal with these feelings?
Badly 
Yes, I do think of him as a good man. And I also think of him as weak. I love him, and I am angry with him.
It would be easier if I could paint him, and my mother, as all bad, but I can't. Everybody has good and bad parts. I do too.
What I feel for him, for my mother, and for my abusive stbxh is a mixture of anger and of pity. For my parents, I probably also still feel love, somewhere in the mix.
My dad's apologies so far have only been apologising for my mother, not for himself (as I've never confronted him). And those apologies annoy me, yes. Apologies by proxy are meaningless.
My feelings for my father are probably a little more mixed because I was the abused person in an abusive romantic relationship too, so I can hardly castigate him for a mistake I also made. However, the deciding factor in me leaving my H was when I visualised what it would do to children to be raised by him. So I can and do remain angry at my father for not protecting me, even though I can't be completely angry at him for not protecting himself.
When I describe my parents to friends who have no experience of relationships with the disordered, they all ask: "So you're dad is a good guy and you're close to him, right?". They don't get that no, I'm not and I can't be. The enabling parent is also guilty of neglect, of allowing abuse to happen on his or her watch. Their passivity is not innocent.