Gosh, what a shocking crime! Emma does not visit neighbours she finds boring as often as she should! Look out Lady Macbeth - you have competition when it comes to vile sins! You may have persuaded your husband to murder his king and his guest, but Emma Woodhouse does not call on her poor neighbours as often as she should! :)

Poor Emma. She devotes her life to keeping her father happy, she is generous and compassionate to the poor, she is polite to Miss Bates, she is even aware of her own faults, and yet gets her attitudes called "very harsh". Yes, Emma should call on her neighbours more often, but as a twenty-year old I think she's doing an amazing job in doing her duty. Of course your view on Emma's misdeeds is your own, but I think Emma is far better at doing her duty than most people on the planet.

I read the section about Emma as not contributing what she ought as referring to her lack of visits, not to any material neglect. As Marianne R says, Emma is materially generous in the matter of the porker, and we see her in chapter 3 feeding her guests much more generously than Mr Woodhouse's care for their health would recommend.

I am not sure what you mean about Emma not understanding the Bateses. I don't see any section where Emma is wrong about them, unlike how she is wrong about Mr Elton. She was wrong about them not having had a letter from Jane, but then Miss Bates herself says that was out of the normal run of things:
That is the reason of her writing out of rule, as we call it; for in the common course, we should not have heard from her before next Tuesday or Wednesday." (chpt 19). I do not think Emma is to be criticised for failing to understand the Bateses because she does not expect them to have received a letter from Jane.