I've had a few kinds when I'm playing a household with kids that I don't want to take care of myself. I've had some that cook regularly and take care of and engage the kids.. I've had some and played the kids and they had to ask for stuff like homework help and it still worked out. Then I've had the sit on your butt and watch tv types. If I want good ones I delete the ones that bug me in managed worlds and hire a new one. If I want bad ones... they show up.. and make me giggle for awhile.
You can always go in and change looks and traits with cheats it sometimes helps.