During install and after it was built.

Rafters were crowned so bad that a straight trim board was inches off the roof mid span which touching on both ends. Corners of house so out of plumb and square that it was impossible to get corner trim on right so siding has to all be shimmed off the house. Doors openings leaned so far doors wouldn’t stay closed unless latched. Roof singles installed so sloppily that the previous course of nails was exposed oh maybe 1/3 the courses.

Many many electrical and hvac issues too, but I didn’t deal with them directly.

If it was any one of the issues it would be not great that it slipped through. But the fact that it was every part/trade that had issues points to a much broader quality control issue. It wasn’t something that slipped through, everything was just shit.