No doubt there are some extenuating circumstances that help lead to Ohana's mom being such a terrible mom.
But that doesn't make it undeserving of criticism. Ohana herself clearly felt it was deserving of harsh criticism.
And there's nothing wrong with viewers assessing characters based on the facts that they currently have in front of them, and adjust as necessary as later reveals require. To say otherwise is to say that we can't have an opinion at all on these characters until the entire anime is finished.
Anyway, it's not like my personal dislike of a character or two is a major issue with my enjoyment level for this show as a whole, or my assessment of its quality. I still like the show a lot, because it does have a lot of good/great characters to its credit.
