Lots of sweeping generalisations on here!
We've been in our Bellway new build for 3 years and have admittedly had some battles with the builder. The customer care department are just utterly incompetant. But, with the exception of some garden niggles everything has been fixed.
Our house is a 4 bed detached, parking for 3 cars with visitor spaces on the street, largish garden, at least 3 metres between us and both neighbours. We're not overlooked and never will be, have plenty of space and everything is clean and fresh. Our master bedroom is huge, which will cause problems if we ever move as we filled it with giant furniture! The estate itself is only 75 houses, no social housing but a certain percentage of smaller, affordable homes. It has a playpark, wide streets and the builders planted trees. It's a lovely place to live. Every house that's sold since we moved in has sold for at least 10% more than the original sale price so they are obviously still desirable.
Honestly, my only niggle has been that there is a 2nd en suite and I think it's unnecessary. I dream of turning it into a walk in cupboard!
Some builders are better than others, we saw every showhome within 30 miles of Glasgow and the finish on some was very basic. Ours was slightly better as standard.
I've got various friends who paid more for 70s properties which are all smaller than ours, inside and out. And all of them have spent tens of thousands since moving in. I would love a Victorian property but it's unlikely to ever be in our price range and we have a lovely family home.