We have a lot of the developer-built homes in our area. The neighborhoods are nice, and depending on who the builder is, you do get what you pay for. There is one company over here I wouldn't buy a home from; you have to do your homework and read reviews before you choose your builder.
A lot of the developers around here build pretty affordable homes in those types of neighborhoods ($150,000-$200,000), but, of course, it depends on what one's family considers affordable. It's diiferent for everyone, obviously.
What I *don't* like about the developer-built neighborhoods is the fact that most of them come with an HOA that one is required to belong to. HOA fees can be pretty high, and they can set rules that dictate a lot of things I would rather choose for myself. The other thing I don't like is that the yards are small. I think the yard should match the size of the house, but that's just my personal opinion. Land is pretty affordable here, so it's possible for most people to have a large yard if they want it. If someone hates yard work (like mowing and gardening), but wants to live in a big house, it would be ideal to have a smaller yard.
A big house has room for a big family...or, if one isn't interested in kids, there is plenty of room to devote to hobbies and entertainment. One can have a sewing room, or an entertainment room, or an exercise room. There is plenty of room for entertaining, or cooking and canning. In the winter, when there is a TON of snow outside (at least here in West Michigan), it's nicer to be in a large house than cramped up without a lot of room to move around. It's only warm enough to sit around outdoors for about 1/3 of the year. I (for one) get grumpy if I don't have a place to be alone once in a while.
I guess what I'm trying to say is, be careful not to criticize too harshly other people's homes.
I imagine there would be a huge outcry if BYCers with "McMansions" started a thread about how they hate all the trailer parks next door, or the houses built in the 50s, or whatever... Out of 30,000+ members, I'm sure some people here live in pretty big houses.
If your home is your dream, and it suits you and it's where you want to be, then it's good enough, and no one else has room to judge.