Many years ago I worked in the central vacuum business. Had a lot of contact with recently purchased b/n home owners. The reports were rarely glowing, some downright nasty. Took the sheen off of the b/n thing for me. One of the most common head shakers was that everything was always out of square. Drywall mud can only fix so much.
the house i moved into was built in 2002, and because of my OCD, i had to rip down a hallway closet and rebuild it because sitting in the living room i can see the wall was WAY out, wouldn't have done it if i wasn't already deep into renos.
Most houses are built on peace work.