What bad quality is shown about Atticus when Scout says "... he was trying to do but Atticus was only a man. It takes a woman to that kind of...

Interesting topic!  The quote you have pulled is a great example of how one character in the book thinks that perhaps Atticus is not a good parent.  Another example would be Miss Caroline who gets angry tha Scout is so far ahead of her classmates because Atticus has taught her to read.

Atticus' sister also thinks he is a bad parent because he does not make Scout wear dresses and learn housekeeping and try to break her tom-boy habits.

Other characters think Atticus is a bad parent, but that is only their perspective.  What do you think?  Is he a bad parent?  Would you say that he is irresponsible because he is absent? Some adjectives to go with this thesis would be guilty, liable, or answerable.

Or would you say that he is the opposite - responsible and trustworthy and simply doing the best he knows how as a single parent?  Scout and Jem seem to think he is a wonderful parent and there is certainly a case to be made for that too.  You might then say he is conscientious, reliable, and sensible.

I hope that helps!  Please post if you have other questions and we can keep "talking."  :)