One of the reasons I chose the developer we did for our newbuild was that they seemed fairly well constructed (and properly spaced out, not crammed in, nicely laid out streets, etc.)
We've had precious few snags, and that seems to be the general theme among my neighbours, and my SiL (himself a builder) checked it out and couldn't find anything to get excited over. Even the corners are all within a degree or two of being right angles, which he says isn't a given in many new builds.
But then others we looked at were obviously rather so lacking that even a lay person like what I is could detect the door that didn't close, the wobbly toilet bowl, the crack in the corner of the window glass...