Definitely agree about him as a crap husband who was probably like an additional child to deal with at times, but wasn't part of the point of it all that he very slowly started to realise this, as both parents gradually learned to move on (towards the ultimately fairly happy ending?)
I'm going purely from memory here (and if has been AGES!) but I'm sure there is a scene where Daniel (as Mrs Doubtfire) and Miranda(?) are talking, and she explains how she didn't like who she was when she was with him, how she became "this horrible person" (the implication being that it was due to his behaviour?), and that she didn't want her kids growing up with a mother like that. And his voice sort of briefly returns to his own momentarily as he looks genuinely concerned/upset, and says something like "but you never..." and then corrects his voice and question and asks (as Mrs D) "Did you never say anything to him, dear?" And she replies "Daniel never liked to talk about anything serious".
i always saw that scene as him beginning to truly start to see things from her point of view /realise his own failings and how she couldn't talk to him, due to the way he was, and how he was ... maybe not dragging her down as such, but bringing out the worst in her by being such an irresponsible pain in the arse! Of course, this was still before he tried to poison Stu with the pepper, so it didn't result in his immediate redemption as a character.... but that final scene was necessary for the Big Reveal and also hilarious (well to teenage me!) Miranda's horrified "the WHOLE time?!" was just spot on as it all slowly dawned on her!
Purely my own interpretation of course...but I always viewed the conversation between Daniel/Mrs D and Miranda as a real moment of self-awareness for his character and a sort of positive character development.... I absolutely loved the film as a child, although can well imagine that many aspects probably haven't aged well at all!
Just to state again that I haven't seen this film for YEARS, merely watched it a lot as a teenager.... so happy to be corrected if I have remembered wrong/accidentally merged two different scenes in my mind or something!
None of this means he WASN'T a massively childish and frustrating husband of course....just that I always saw it as intentional/key to the story and its development? And ultimately it seemed that their relationship did look like it improved (as separated co-parents who had probably to realise that they genuinely were better off apart.....) I remember genuinely finding the ending comforting, with divorced parents myself.
Having said that, would hardly dare go back and watch it again now just in case it really isn't as I remember! Interesting thread!