I think there are lots of things to consider but I believe in general people with negative attitudes are down to assuming all large families are scrougers, thinking you shouldn't be able to cope with a lot because THEY can't and this over populating the planet thing.
Personally, I have 7 children and everyone told me I should stop at 2 because this was socially acceptable and no one could understand how I could possible cope with more than that.
Having less children does not automatically mean they are better looked after, that you can afford more, that they are happier etc. it all depends on who your parents are. You can get one child with wealthy parents who grows up miserable and messed up and contributing nothing to society.
I always feel sorry for the only children I see at the park who come over to my kids for someone to play with and I have known more than a few spoilt and selfish only children.
Yes, I am busy. Yes my children are expected to do things in the home and to help out but I would make them do that whether I had this many or only 1 as this was how I was raised and I am only one of 2! My children love being together, yes they argue but they also always have someone to play with, talk to and share things with. They all have their own personalities and interests and I am aware of their individuality and treat each one accordingly. They all get mummy time and cuddles.
As for play dates, invites etc. I am not overly sociable. This would not matter if I had one child. I am not the type to invite people to my home or want their children there, it's a personal thing so sometimes I make the excuse of not having time to appear 'normal' as people cannot understand why I wouldn't want to do things but I don't like to so I don't. Simple. I don't let my kids go to other people's houses as I don't expect people to feed and look after them (or think Im taking the mick because I wont do it back!) they go to parties though (which can get expensive) but I don't want them to miss out.
I don't have a ruined body. Again some people with one get major health implications. I do not expect my elder ones to 'babysit' the smaller ones. I don't expect anyone when they are older to be at home to help me. I would never dream of asking them to change a nappy or anything, they actually ask if they can help with the baby's feeding etc and I have to tell them no, she isn't a toy!
Money is all relative, you are not automatically a deprived child because you don't have the latest things or go on holiday every year. I didn't and it didn't emotionally scar me! I also shared a room my whole life. Again only two of us.
As for the drudgery of life at home with kids. Some of us enjoy being stay at home mothers and that is why we have a lot of kids in the first place. We are also organised, resourceful and hard working. We are not all lazy welfare mothers who sit on their fat bums all day watching daytime telly.
My children are never late for school, they always have their homework done and do well, they are some of the better turned out in the mornings at school in terms of neat hair/clean ironed uniform. They don't get in trouble. They are polite. They don't run the streets all hours of the day like some kids I see out unsupervised till 7pm still in their uniform. There are so many things I don't like about how other people treat or raise their children but its none of my business, just like its none of anyone else's what I do.
I always said I would stop when I felt my body couldn't handle it anymore and we ran out of room and money, otherwise I probably would never stop.