The Bonies I have had around have cleaned the house in the area of wash dishes, clean showers and toilets and unclogs them. She'll fix anything that is broken, which can be a problem if you are working on handiness skills, but I have my sims increase handiness by reading the books. I do have a mean side of me that likes to see her working on the dishwasher when it breaks down and she get electrocuted.
She rakes leaves in the fall also, which can be a problem as she then ignores the household chores. I just dismiss her, she comes inside to get into her coffin and then I awaken her and she will then clean the house and fix anything that is broken.
With babies and toddlers I do have to put her in her coffin and put it in an area she can't get out, box her in by taking the door off the room I usually build for her. She just won't leave them alone. She is always waking them up to hold and snuggled, coo and sometimes will give them a bottle, but not that often. She interfers in all areas with them; they can't get the sleep needed so they cry because they are tired. Which wakes up the parents so they can't get their sleep, so everyone is cranky.
I always get a Boney, and if she does thinks I don't like, or doesn't do her chores, which can happen, I just get rid of her and get another.
As for the bar, I quit having one of them, I can't seem to get my Bonies to leave it alone, they fix a drink, make a puddle which they then mop up, fix another drink and make another puddle which they then mop up, and the cycle continues. So, no bars.
I don't have party sims, no parties at my home, so it isn't a big loss for me, but for those who do, it can be a pain in the rear.
For me, the pluses outweight the negatives, so I like to have them around, never thought of having more than one though, good idea with you have a big family.
Strange how no one in the family freaks out when she walks in on them. Let one member walk in the bathroom on another member and they freak out and have negative moodlets. But Boney, they just ignore her and finish using the toilet and do the twirl to take the shower, with her in there.