We are talking about the mob here, yer pretty much not gonna get a faithful husband (unless you coun't Mikey, but do you want to be in Kay's place?.) So I think that Sonny is a "good" husband. Mikey I think is good as far as he really cared about Kay and when he thought she was leaving he was trying to get her to stay. Sigh... I dunno. Like I said in the mob, "good enough" is the best you can hope for! lol
I thought Michael was a very good husband up until the point he slapped Kay and kept her from seeing the kids in Part II. He did lie to her, but that was because he didn't want to involve her in his illegal activities. But he never ignored her or cheated on her. I also thought Vito was a good husband to Mama.
